576 
DR. MARTIN BARRY’S RESEARCHES IN EMBRYOLOGY. 
mental chorion (par. 372.). On the left side, this process was more 
advanced than elsewhere (see figs. 252 and 253.). The cells internal to 
the membrane / were invested by a proper membrane, between which 
and the membrane /there was a considerable space filled with colourless 
and transparent fluid (pars. 338. 339. 342. 343. 360.). This fluid con- 
tained two minute cells which had escaped liquefaction (par. 350.). 
They presented objects in their interior. 100 diarn. 
Fig. 186. An ovum of 24| hours from the uterine side of the middle of the Fallo- 
pian tube, measuring in diameter about yt'". The incipient chorion 
( cho .) was beginning to imbibe a transparent colourless fluid ( f l ), and to 
rise from the membrane /( par. 374.). The cells internal to the mem- 
brane / were invested by a proper membrane, between which also and 
the membrane /there was a colourless transparent fluid (pars. 338. 339. 
342. 343. 360.). In this fluid there was a minute cell which had 
escaped liquefaction (par. 350.). This minute cell contained several 
still minuter cells. It is a superficial view of the ovum which is pre- 
sented in this figure. 100 diarn . 
Fig. 187. An ovum of 24^ hours from the uterine side of the middle of the Fallo- 
pian tube, measuring in diameter about yj". The incipient chorion 
(cho.) was beginning to imbibe fluid (f l ), and to rise from the membrane 
/ (par. 374.). The cells in the central portion of the ovum were invested 
by a proper membrane (e), between which and the membrane /there was 
a fluid (pars. 338. 339. 342. 343. 360.). In the latter were two minute 
cells which had escaped liquefaction (par. 350.), their interior present- 
ing cells still more minute. This figure exhibits a section of the ovum 
through its centre. The germinal vesicle ( c ) was still visible, and 
measured in diameter about -£§■". It was filled with cells, two of which 
(bs) — larger than the rest, but still incipient only (par. 346.) — occupied 
the place in which the point of fecundation is last seen. The minute 
cells immediately surrounding these two larger ones, were arranged in 
a layer. 100 diarn. 
Fig. 188. An ovum of seventeen hours from the Fallopian tube near the middle 
part, measuring in diameter y^"'. It was taken from the same Rabbit 
as the ova of figs. 190 and 191. The cells in the central portion of the 
ovum were invested by a proper membrane, e (/□"'), which however 
had become thin preparatory to its disappearance (pars. 338. 339. 342. 
343. 360.). Those cells seemed to be undergoing liquefaction. Between 
them were minuter cells, which, as well as the objects in the centre of 
the larger cells, appeared like an assemblage of black points until 
viewed — as in the following figure — with a higher power (par. 351.). 
100 diam. 
