History of the development of the human ovum, with a comparative view of the development of the ova of mammalia and birds / translated and abridged from the German of G. Valentin ... by Martin Barry.
- Gabriel Valentin
- Date:
- [1834?]
Licence: Public Domain Mark
Credit: History of the development of the human ovum, with a comparative view of the development of the ova of mammalia and birds / translated and abridged from the German of G. Valentin ... by Martin Barry. Source: Wellcome Collection.
Provider: This material has been provided by The University of Glasgow Library. The original may be consulted at The University of Glasgow Library.
20/40 page 16
![Diameter of Granfian Germinal Miscellancoia Vesicle. Ovulum. Vesicle. Parts Vn. Cow, . 1. 0,00.5176 0,002'264. VIII. Sheep, 1. 0,006686 0,004204 f 0,005176 0,001619 IX. Cat, . from J to to (0,004636 0,001509 oemidiameter of the disk surrounding the ovulum. Mean, 0,004205 (0,000215 Diameter of the globules contained in this disk, to (0,000080 X.Man, ]. 0,003126 0,001939 2. 0,003343 0,002048 Diameter of the disk surrounding ovulum No. 1, 0,005931 From these measurements, the following results are deter- mined : 1. It is obvious that the absolute size of the Graafian vesicle is subject to much greater variation than that of the ovulum. 2. The ovulum is, in relation to the Graafian vesicle, so much the larger, the more recently formed and smaller the latter. 3. The germinal vesicle does not follow in the Mammalia and in man, the same relations in size as in the bird, where in this respect, it is proportioned to the yolk-ball, just as the ovulum of the Mammalia is to its Graafian vesicle. It appears rather, as we shall in the parts of the embryo have frequent opportunities for seeing, to be laid down of a certain determined size, and upon the whole, to vary little according to its conditions in regard to age. 4. The size of the globules contained in the ovulum of the Mammalia differs much from that of the yolk-globules of the bird, but approaches more or less that of the minute particles found be- tween the latter. For several other more special relations in the above measure- ments, vide Bernhardt's dissertation already mentioned.* Having now without any subordinate remark, without any ten- dency towards analogy, described the simple facts seen or dis- covered by others and by ourselves, we undertake, in the next place, to determine the signification of the parts named. This would admit of being stated with decision, did we possess a suf- ficient and complete analysis of the ovulum, that is found, soon after its exit from the ovary, in the beginning of the tubes. But so long as this is wanting, there must necessarily remain many gaps to be mentioned soon. Yet an accurate knowledge of tlic ovulum and of its parts, as contained in the Gnxafian vesicle, may enable us to arrive at no small degree of certainty on this subject. • Cap. vi. ]>. 30-32.](https://iiif.wellcomecollection.org/image/b2147459x_0020.jp2/full/800%2C/0/default.jpg)
