The microscope and microscopical technology : a textbook for physicians and students / by Heinrich Frey ; translated from the German and edited by George R. Cutter, from the fourth and last German edition.

Date:
1872
Catalogue details

Licence: Public Domain Mark

Credit: The microscope and microscopical technology : a textbook for physicians and students / by Heinrich Frey ; translated from the German and edited by George R. Cutter, from the fourth and last German edition. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    consequently overlooked for so long a time. Young kittens in the first weeks of their life are to be recommended here; as fluids, weaker solutions of chromate of potash, or the Miiller's eye-fluid. A stratum of free ovum cells, which is said to have been observed close under the surface of the ovary (Schron, Grohe), does not exist, as the small cells of the so-called forma- tio granulosa surrounding these ovula were destroyed by the action of the reagents (alcohol and strong chromic acid). l^ow whence came the ovular strands and the ovules which they contain ? The peculiar ovarian epithelium, which we have previously mentioned, sends conical proliferations into the peripheral stra- tum of the organ. Some of the cells of the cone become ova, and by separation from the epithelial matrix the ovular strand is formed. The Graafian follicle constantly approaches the surface of the organ in proportion as it approaches its maturity, so that, finally, entirely matured, it is only covered by a thin fibrous layer of the albuginea. It is well known that as a result of increased congestion of the walls of the follicle, the collection of fluid in a Graafian vesicle becomes greater and greater, and that thus a rupture of the latter may take place, naturally at the point of the slightest resistance, that is, at the surface of the ovary. This bursting of the follicular walls, which frees the ovulum and renders its further development possible, is also promoted by still another phenomenon, a cell-proliferation at the base and on the lateral walls of the follicle. A recently ruptured follicle of the human female occasion- ally presents us a lump of coagulated blood (coming from the lacerated parietal vessels), but always, however, the layer of plicated substance which has a yellowish appearance from the fat it contains. Our fig. 300 at df'' shows this proliferating stratum, which probably consists of derivatives from the cap- sular epithelimn, but principally, however, of the cells of the inner parietal layer, and which also, at this time, contains nu- merous emigrated lymphoid cells (^Yaldeyer). THiile a portion of these cells are destroyed by fatty degeneration, an active