Quarterly Journal of Microscopical Science, Volume 19J. and A. Churchill, 1879 |
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Expressions et termes fréquents
abactinal alveoli ambulacral amongst animal aperture appears arenaceous become blastomeres blood body canal cavity cells lining cephalic chambers Characters.-Test chromic acid clefts close colour columnar condition connection considerable contain contractile vacuole Crinoids described diam diameter distinct dorsal dredgings ectoderm Elasmobranchii elongated embryo epiblast epithelial cells epithelium fathoms fibrils figures filaments flagella flagellum Foraminifera ganglion genus germinal streak granular granules groove head-kidney hypoblast intestine intracellular network invagination latter Lavdowsky layer length less lobe longitudinal lumen membrane mesoblast mesoderm millim mouth mucous cells mucous glands Müllerian duct notochord nucleus observed olfactory nerve olfactory pit opening oral organisms parietal cells portion posterior present primitive protoplasm radial regard rounded rudiment seen segmental duct side species specimens stage stained structure submaxillary gland substance surface thick thickened tion trace transverse tubes ventral walls whilst Wolffian duct
Fréquemment cités
Page 430 - Around the segmental organs in the feet are peculiar cells richly supplied with trachese, which appear to me to be similar to the fat bodies in insects. There are two glandular bodies in the feet in addition to the segmental organs. The more obvious features of the nervous system have been fully made out by previous observers, who have shown that it consists of large paired supracesophageal ganglia connected with two widely separated ventral cords — stated by them not to be ganglionated.
Page 423 - ... medullary groove is not at first continued back to it. The anterior wall of this passage connects together the medullary plate and the notochordal ridge of the hypoblast. In the succeeding stages the medullary groove becomes continued back to the opening of the passage, which then becomes enclosed in the medullary folds, and forms a true neurenteric passage. It becomes narrowed as the medullary folds finally unite to form the medullary canal, and eventually disappears. I conclude this paper with...
Page 429 - I have had an opportunity of making investigations on some well preserved examples of Peripatus capensis, a few of the results of which I propose to lay before the Society. I shall confine my observations to three organs. (1) The segmental organs, (2) the nervous system, (3) the so-called fat bodies of Mr. Moseley. In all the segments of the body, with the exception of the first two or three postoral ones, there are present glandular bodies, apparently equivalent to the segmental organs of Annelids....
Page 1 - Mullerian duct. With reference to this we have come to the conclusion that the Mullerian duct does not develop entirely independently of the Wolffian duct. The third section of our paper is of a more general character, and contains a discussion of the rectifications in the views of the homologies of the parts of the excretory system in Aves, necessitated by the results of our investigations. We have, as far as possible, avoided entering into the extended literature of the excretory system, since...
Page 430 - The ventral nerve cords are covered on their ventral side by a thick ganglionic layer,1 and at each pair of feet they dilate into a small but distinct ganglionic swelling. From each ganglionic swelling are given off a pair of large nerves2 to the feet ; and the ganglionic swellings of the two cords are connected together by a pair of commissures containing ganglion cells?
Page 378 - In these filaments," writes Dr. Klein, " highly refractive spores make their appearance (fig. 12). These become free after the disintegration of the original filamentous matrix. The fully developed spores of our bacillus differ from those of hay-bacillus and anthrax bacillus by being more distinctly cylindrical and much smaller." In a footnote it is mentioned that in the figures accompanying Koch's first paper in Cohn's
Page 9 - Aves and Amphibia in relation to these structures is the fact that in Aves the anterior pore of the head-kidney remains as the permanent opening of the Miillerian duct, while in Amphibia, the pores of the head-kidney atrophy, and an entirely fresh abdominal opening is formed for the Miillerian duct. II. The Growth of the Miillerian Duct. Although a great variety of views have been expressed by different observers on the growth of the Miillerian duct, it is now fairly generally admitted that it grows...
Page 110 - I had occasion to examine the blood of a considerable number of animals, and eventually (July 1877) detected organisms in the blood of a rat, which at first sight I took to be of the nature either of vibrions or spirilla. The blood, when transferred to the microscope, appeared to quiver with life, but for some considerable time nothing could be detected to account for this animated condition, as the blood-corpuscles were somewhat closely packed. On diluting the blood with a half per cent, solution...
Page 385 - Having, however, found that he could procure more than could be accommodated in the cage which he had brought with him, he obtained a large earthen vessel, transferred twenty-seven rats into it, and tied a piece of cloth over the mouth of the vessel. As may be supposed, the rats had perished before he got home — all except one. I examined the blood and the spleen of twenty of these rats within about six to eight hours of their having been caught, and found in each case that there were innumerable...
Page 111 - body ' portion becomes flattened towards its middle to double its original width, and both ends become almost acutely pointed. The flagellum part is only visible for about half its true length, and this portion of it appears to consist of the same substance as the body. Possibly the now invisible portion of the flagellum may consist of a substance slightly different from that of the body ; or may have been retracted during the drying. I have...