DR. MARTIN BARRY’S RESEARCHES IN EMBRYOLOGY. 
569 
430. Explanation of the Plates. 
N.B. In all the figures the same letters denote the same objects ; as may he seen by 
the explanation at the foot of each Plate . The same letters are used as in the First 
and Second Series. (These remarks, however, do not apply to the letters a, /3, y, in 
Plate XXVIII.) The term “ Rudimental Embryo ” is applied to the object bb, in- 
stead of “ Germ," employed in the Second Series ; and “ Germ ” is now applied to 
the object bs. 
b. Germinal spot beginning 1 to resolve itself into cells. 
bs. Twin cells — foundation of the new being — germ — group of cells — mulberry- 
like object. 
bb. Rudimental embryo. — (“ Germ” of Second Series.) 
c. Germinal vesicle, more or less filled with cells. 
e. Proper membrane of the substance by which the germinal vesicle is sur- 
rounded. 
f. Thick transparent membrane of the ovum — “ zona pellucida.” 
f 1 . Fluid imbibed by the chorion. 
g ] . Cells of the tunica granulosa. 
g 2 . Cells of the retinacula ovi. 
cho. Incipient chorion — chorion (becoming villous in the uterus). 
PLATE XXII. 
( All the Figures are from the Rabbit ( Lepus Cuni cuius , Linn.)). 
Fig. 156. An ovarian ovum of - The Graafian vesicle — about f r — from which 
it was taken, exhibited no appearance of preparation for discharging its 
ovum, while a number of others in the same ovary had obviously been 
destined to do so. (The animal was killed seven hours post coitum.) This 
figure represents the substance lying immediately within the thick trans- 
parent membrane /' namely a layer of regularly elliptical and flattened 
objects — discs — each of which contained minuter objects of the same 
kind, concentrically arranged around a pellucid point (par. 337.). The 
germinal vesicle (c) was spherical. The germinal spot ( b ), directed to- 
wards the surface of the ovum, exhibited incipient cells at its free part 
(par. 327-). The centre of the spot was pellucid. 100 diameters. 
Fig. 157. An ovarian ovum of fj". The Graafian vesicle containing it (about f") 
presented no appearance of preparation for discharging its ovum, while 
several others in the same ovary were in a state of forwardness in this 
respect. (The animal was killed 5^ hours post coitum.) The objects 
on the inner surface of the membrane f differed from those of the pre- 
ceding figure, in many of them appearing to have undergone partial 
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