Download or read book Quarterly Journal of Microscopical Science 1915 Vol 60 Classic Reprint written by Ray Lankester and published by Forgotten Books. This book was released on 2018-10-09 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Quarterly Journal of Microscopical Science, 1915, Vol. 60 The operculum is generally elongate or unguiform, and so small that it is useless for closing the mouth of the shell when the animal has withdrawn itself inside. The shells are covered with yellowish periostracum, which in some species is only a thin, smooth, transparent, but tough coating. In others, as in C. Tulip a, the periostracum is exceedingly thick and of a dark-brown colour. It is rough, furrowed longitudinally, and of a leather-like texture, and has tufts or outgrowths disposed in even rows along its surface. When dry, this thick periostracum becomes very brittle and peels OR the shell. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Download or read book Quarterly Journal of Microscopical Science 1921 Vol 65 Classic Reprint written by Ray Lankester and published by Forgotten Books. This book was released on 2018-02-11 with total page 792 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Quarterly Journal of Microscopical Science, 1921, Vol. 65 We have now to inquire to what extent they are present in other phases and this with Special reference to the assertion of B o n n e V i e and V ej d 0 V s k y that at the telophase one part. Of the chromosome axis is cast out into the new karyoplasm, whilst another persists as a Spirally coiled thread which forms the rudiment of the new chromosome. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Download or read book Quarterly Journal of Microscopical Science 1916 Vol 61 Classic Reprint written by Ray Lankester and published by Forgotten Books. This book was released on 2017-12-20 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Quarterly Journal of Microscopical Science, 1916, Vol. 61 The present research is now finished, and we have seen that the results obtained contradict the proposition put forward in my earlier paper upon this. Organism. I have carefully checked the measurements that led me to put forward this proposition, and have found them to be accurate; but the new evidence before us shows that it cannot be universal. In the circumstances, another negative proposi tion seems to have been established concerning the Spindle. We have found that it is not a figure formed entirely by the action of forces at its poles; we have found that its length at the conclusion of the metaphase is not proportional to the volume of the chromatin; and we have now found that the length at this stage is not proportional to the volume of the cell. We must, however, remember that these negative propositions have been established for individual cases, and are therefore generalisations only in that their antitheses cannot be put forward as being invariably valid. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Download or read book Quarterly Journal of Microscopical Science 1900 Vol 43 Classic Reprint written by and published by Forgotten Books. This book was released on 2018-02-04 with total page 786 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Quarterly Journal of Microscopical Science, 1900, Vol. 43 By edwin S goodrich, m.a., Aldrichian Demonstrator of Comparative Anatomy, Oxford. (with Plates 37422) About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Download or read book The Quarterly Journal of Microscopical Science 1895 Vol 38 Classic Reprint written by E. Ray Lankester and published by Forgotten Books. This book was released on 2018-03 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from The Quarterly Journal of Microscopical Science, 1895, Vol. 38 A Criticism of the cell-theory being an Answer to Mr. Sedgwick's Article on the Inadequacy of the Cellular Theory of Development. By gilbert C. Bourne, f..l S., Fellow of New College. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Download or read book Quarterly Journal of Microscopical Science 1901 Vol 44 Classic Reprint written by and published by Forgotten Books. This book was released on 2017-09-12 with total page 630 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Quarterly Journal of Microscopical Science, 1901, Vol. 44 The bearing of young, however, is not possible at all times during the reproductive period. In the course of that period there are intervals during which the generative organs of all mammals exhibit, on the one hand special activity, and on the other hand a fallow condition. This variation is periodic, and is due, not to a periodic degeneration from a stable con dition, but to the periodic accession of a special stimulus, culminating in sexual desire, and resulting in coition and in gestation in the female when conception takes place. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Download or read book Quarterly Journal of Microscopical Science 1895 Vol 37 Classic Reprint written by and published by Forgotten Books. This book was released on 2017-12-21 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Quarterly Journal of Microscopical Science, 1895, Vol. 37 Scattered here and there in the test-substance are groups or nests of rather large cells (pl. 1, fig. 10) containing rounded deeply staining masses of varying size and appearance. The protoplasm is Often very granular, and no nucleus is visible. It is possible that these Obscure bodies represent the test phagocytes of Maurice, to which he ascribes the function of absorbing the dead zooids, but it is to be noted that here they do not occur in relation to the masses described above as possibly representing degenerated zooids. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Download or read book Quarterly Journal of Microscopical Science 1907 Vol 51 Classic Reprint written by Ray Lankester and published by Forgotten Books. This book was released on 2017-10-21 with total page 688 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Quarterly Journal of Microscopical Science, 1907, Vol. 51 Sections Of material fixed in absolute alcohol were found to be particularly valuable for demonstrating the arrangement of the pigment in the pineal eye, this pigment, as is well known, being soluble in acids, and, therefore, often entirely absent from material treated with strongly acid hardening rc-agents, such as Flemming's solution or Zenker's fluid. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Download or read book Quarterly Journal of Microscopical Science Vol 64 written by Ray Lankester and published by Forgotten Books. This book was released on 2018-02-10 with total page 674 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Quarterly Journal of Microscopical Science, Vol. 64: 1919-20 A Quarterly Chronicle of Microscopical Science containing much useful miscellaneous information was introduced in 1871 and formed a special department of the Journal for'quarterly journal OF microscopical science' About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Download or read book Quarterly Journal of Microscopical Science Vol 8 written by Edwin Lankester and published by Forgotten Books. This book was released on 2018-02 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Quarterly Journal of Microscopical Science, Vol. 8: With Illustrations on Wood and Stone Starch, from its physiological importance, remarkable structural peculiarities, and general diffusion through the vegetable kingdom, has been a favourite subject of investigation with physiologists and microscopists. However, not-withstanding the attention which has been devoted to its structure and development, it is acknowledged by the greatest physiologists to be known but little of. (See Mr. Busk's paper on "Starch Granules," in the number of the 'Quarterly Journal of Microscopical Science' for April, 1853.) There are, doubtless, intrinsic difficulties attending the investigation of this substance, but these have been very much augmented by the principle on which the examination has been conducted, namely, the cellular hypothesis. If this hypothesis had been in itself correct, and admissible as a basis of explanation of the facts connected with the structure and mode of formation of the starch granule, it ought, considering the amount of talent and ingenuity which have been employed in its application to these inquiries, to have thrown more light upon these much disputed, and as yet entirely unsettled questions. After this apology for thus differing from the high and almost universally credited authorities of the present day, I shall proceed to explain on a new principle - one strictly mechanical in its immediate operation - "the principle of molecular coalescence," - those points connected with the structure and development of starch granules, by which physiologists and botanists have been so long puzzled. In this paper the same train of reasoning will be employed, and the same experimental data adduced, as in my last paper, that on the "Structure and Mode of Formation of the Dental Tissues," as also in that on "Shell Structures;" and hence, though treating of a very different class of organized structures, this is still but an extension of my former researches. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Download or read book Quarterly Journal of Microscopical Science Vol 1 Classic Reprint written by Edwin Lankester and published by Forgotten Books. This book was released on 2018-02-03 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Quarterly Journal of Microscopical Science, Vol. 1 When the Rotifer is in a state of expansion and activity, its outer extremity is terminated by a large horseshoe-shaped wheel-organ, or trochal disc (figs. 2, connected with the body by a narrowed neck. When contracted and at rest, the whole of this apparatus is drawn in, and the body takes on a more pyriform appearance (fig. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Download or read book Quarterly Journal of Microscopical Science 1906 Vol 49 Classic Reprint written by E. Ray Lankester and published by Forgotten Books. This book was released on 2017-10-22 with total page 866 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Quarterly Journal of Microscopical Science, 1906, Vol. 49 The foetal membranes and placenta of the elephant were described by Owen (13) in 1857, who obtained from Dr. Morton in India the membranes of a foetal elephant. These mem branes, which had been preserved in a keg of arrack, were supposed to have been of the period at about the middle of the period of utero-gestation. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Download or read book Quarterly Journal of Microscopical Science Vol 6 Classic Reprint written by Edwin Lankester and published by Forgotten Books. This book was released on 2017-09-13 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Quarterly Journal of Microscopical Science, Vol. 6 In September last, being engaged in an inquiry into the process of inflammation in the web of the frog's foot, I was desirous of ascertaining more precisely the structure of the minute vessels, with a view to settling a disputed point regarding their contractility. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Download or read book Quarterly Journal of Microscopical Science Vol 21 Classic Reprint written by E. Ray Lankester and published by Forgotten Books. This book was released on 2018-01-23 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Quarterly Journal of Microscopical Science, Vol. 21 The zooecia are about 0045 inch long by 002 in width, which is tolerably uniform from top to bottom. The outer border, as in most species of Bugula, is hollowed on the ex ternal border and towards the lower end in most of the zooecia, a sort of step is thrown out (pl. I, fig. Upon which is articulated the avicularium. The inner border is evenly rounded, and the upper and inner angle is completely rounded off, whilst the external is produced and crowned with a short, pointed, spinous process. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Download or read book Quarterly Journal of Microscopical Science Vol 5 Classic Reprint written by Edwin Lankester and published by Forgotten Books. This book was released on 2018-02-04 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Quarterly Journal of Microscopical Science, Vol. 5 Metamorphoses of man and the lower animals, by A. De Quatrefages, translated by Dr. H. Lawson, 37, 151. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Download or read book Quarterly Journal of Microscopical Science 1897 Vol 39 Classic Reprint written by E. Ray Lankester and published by Forgotten Books. This book was released on 2018-02-04 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Quarterly Journal of Microscopical Science, 1897, Vol. 39 The fact that the tint of the worm is due to contained blood, and not to any pigment in the skin, is readily recognised by the unaided eye when the alternating processes of eversion and retraction of the proboscis or introvert is watched. So long as the introvert is at rest within the body the thorax is coloured; when eversion takes place the tint becomes quite faint (pl. 1, fig. - in fact, frequently the thorax becomes white. The blood in the thorax is contained in greatly dilated vessels, which block up and obliterate nearly the whole of the coelom (fig. The introvert is a hollow sac traversed by thin bundles of retractor muscles, the cavity of the sac being con tinuous with the dilated vessels, so that on eversion nearly the whole of the blood in the thorax is driven into the introvert this flow of blood is, of course, the cause of the eversion, - and the thorax is more or less completely deprived of its colour. The fact that the abdomen is not tinted by the blood to any great degree is due to the small size of the blood-vessels in this region. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Download or read book Quarterly Journal of Microscopical Science 1899 Vol 41 Classic Reprint written by and published by . This book was released on 2015-06-28 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Quarterly Journal of Microscopical Science, 1899, Vol. 41 On both sides of the Atlantic, latitude 40 N. marks approximately the southern limit of Arenicola marina. South of this it is replaced in the Mediterranean by A. Claparedii, Lev., and by A. cristata, Stimps., the latter also ranging on the west side of the Atlantic from Cape May (N. J.) to the Caribbean Sea. Its reputed occurrence on the north coast of Alaska (Murdoch), at Vancouver Island (Marenzeller, 1887), Coquimbo, and South Africa requires confirmation. An abundant, widely ranging, and undoubtedly old form such as Arenicola, might be expected to vary considerably in its habits and structure, though it has not hitherto been ascertained how far this is the case. Having paid special attention to this point, we have found that there are (at least on the Lancashire coast) two varieties of A. marina, differing in habits, structure, and times of maturity, and that there is, in addition, considerable individual variability. (1) From high-water mark down to the beginning of the Laminarian zone, the common shore lugworms (or "lugs," as fishermen call them, in contradistinction to the second variety, or "worms") sink their U-shaped burrows to a depth of from one to two feet below the surface. One end of the burrow is marked by a casting, the other by a "countersunk" hole, through which the head of the lugworm is protruded when the tide comes in. The size and colour of the animal vary with the amount of muddy organic matter in the sand. Where there is comparatively little mud, the Arenicola average about seven inches in length and are somewhat transparent, so that the superficial blood-vessels can be clearly seen through the thin body-wall. The gills, which are not very strongly developed, are composed of nine to eleven branches, each provided with three to five pairs of short lateral twigs (Pl. 1, fig. 3). The proboscis and prostomium are only slightly pigmented, and being very vascular, appear red in colour. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works."