DR. MARTIN BARRY ON THE CORPUSCLES OF THE BLOOD. 267 
blood-corpuscles, forming- ova. They differed from the objects of the 
preceding figure in retaining more the appearance of discs ; the transi- 
tion from which is here very obvious , — a having apparently undergone 
no further perceptible change than that of becoming round. (3. The 
outer portion now consists of discs, — the inner part being itself a disc, 
the future germinal vesicle, y. A more advanced state ; the part c, 
corresponding to the central disc of (3, being now the germinal vesicle. 
In the object not marked, two discs seemed to occupy the situation of 
c in y. (Acetic acid.) 
Fig. 166. From the same ovary. Part of a group of corpuscles having the same 
appearance as young blood-corpuscles, just escaped from a parent cor- 
puscle, such as that in fig. 164. They were blood-red, and appeared 
to be membranous at the surface. These objects are rudimental ova. 
The letters as above. A distinct orifice in c. (Acetic acid.) 
Fig. 167- From the same ovary. Part of a group of objects of the same kind, 
colour, origin, and general appearance, except that they were not mem- 
branous at the surface. One of the germinal vesicles, c, is larger than 
the rest ; and the orifice in it is of considerable size. (Acetic acid.) 
Fig. 168. From the same ovary. State of the rudimental ovum (altered corpuscle 
having the same appearance as a blood-corpuscle) rather more advanced. 
The germinal vesicle (c) was larger, and the discs g were dividing into 
minuter discs. These discs were quite red. (In one instance, in which 
the size of the rudimental ovum was about the same, the discs g had 
begun to coalesce for the formation of the membrane of the ovisac.) 
(Acetic acid.) 
Fig. 169. From the ovary of the same Bird. Conditions which, excepting «, are 
still more advanced, a. Still blood-red. (3. In outline. Redness di- 
minished. Globules between the discs, y. Chiefly in outline. Each 
of the discs presented a cell-like object in the situation of its original 
depression, h. Blood-red. The discs g dividing into smaller discs. 
The germinal vesicle (c) obscurely seen in the interior. 
Fig. 170. From the ovary of the same Bird. Portion of an ovisac, elliptical in 
form, and in length. Partly in outline, h. Membrane of the ovisac, 
forming out of the discs g, which for this purpose are dividing into mi- 
nuter discs, g. Quite red, and becoming pale in h. c. Portion of the 
germinal vesicle. 
Fig. 171. From the same ovary. Similar objects in a more advanced state. Length 
of the ovisac The discs g, within the ovisac, were smaller than 
those in fig. 170; having undergone division. Where lying around 
the germinal vesicle (c), they were smallest, had a high refracting power, 
and were quite red. Proceeding from this situation towards the mem- 
2 N 
MDCCCXLI. 
