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, j ust 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 a, are 

 still more advanced, a. Still blood-red. j3. 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. S. 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 -j^'" 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- 



MDCCCXLI. 2 N 



