Archive image from page 98 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana05todd Year: 1859 Ova of the Rabbit from the Fallopian tube three days after impregnation. A, shows on a dark ground one of these ova, of •which B is an explanatory outline, y, s, are the yolk segments of which there were eight; z, the zona; a, the thick layer of albumen which in this animal is always deposited on the exterior of the zona after the granular cells have been removed from it. c and D. Other ova from the same animal; in D, are shown three projections of the albumino
Archive image from page 98 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana05todd Year: 1859 Ova of the Rabbit from the Fallopian tube three days after impregnation. A, shows on a dark ground one of these ova, of •which B is an explanatory outline, y, s, are the yolk segments of which there were eight; z, the zona; a, the thick layer of albumen which in this animal is always deposited on the exterior of the zona after the granular cells have been removed from it. c and D. Other ova from the same animal; in D, are shown three projections of the albuminous covering which have been taken for villi of the chorion; but which according to Bischoff are not so. This ovum was farthest down in the Fallopian tube. In a series of observations made by myself on the ovum of the dog and rabbit dining their descent from the ovary to the uterus, in the summer of 1840, I was induced to adopt the opinion that a new deposit does really occur on the surface of the ovum in both of these animals. I repeatedly ob- served the large gelatinous or firm thick albuminous covering on the rabbit's ovum when it had just entered the cavity of the uterus; and in several instances 1 thought I could perceive the first formation of the villi of the chorion by sprouting or budding from the surface of the newly deposited sub- stance, which, as in Wharton Jones' and Barry's observations, it was quite easy to dis- tinguish from the membrane of the zona. In the ovum of the dog I admit, with Bischoff, the appearance is very different ; but yet my observations appeared to me to demonstrate that in that animal also a substance is super- added to the surface of the zona, for that mem- brane, which presents at an earlier period a Ovum of the Dog from the Fallopian tube ten days after impregnation. A. The yolk has undergone division into eight segments, and there is a thin irregular deposit of albumen on the outer surface of the zona. (This is represent> d too l
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