218 
CHAS. H. o’DONOGHUE. 
Series of 
corpus 
luteum. 
Series No. of 
mammary 
gland. 
Condition of the embryo 
or ovary. 
Condition of 
corpus luteum. 
Condition of 
mammary gland. 
A 
3 and 4 
Ovary with ripe 
follicles 
None 
At rest. 
B 
5 and 26 
Immediately after 
rupture of Graafian 
follicles 
Commence- 
ment of 
formation 
Commence- 
ment of 
growth. 
c* 
6 and 7 * 
Ova in 1- and 2-cell 
stages 
Forming 
Growing. 
D 
Ova in 16- and 32-cell 
stages 
Forming 
E 
8 
1 Blastodermic vesicles 
| 1 mm. in diam. 
Formed 
Growth 
marked. 
F 
— 
! Blastodermic vesicles 
i 2 5-3 mm. 
Growing 
— 
F,* 
9 * 
Blastodermic vesicles 
max. 3 5 mm. 
Growing 
Increased 
growth. 
G 
10 
Blastodermic vesicles 
3'5-4 mm. 
Growing 
About height 
of growth. 
H * 
12 * 
; Blastodermic vesicles 
1 65-7 mm., primi- 
tive streak stage 
1 
Large cor- 
porealutea, 
about the 
full devel- 
opment of 
same 
Growth 
slower. 
K 
17 
Late uterine stage, 5 75 
mm. embryo 
Constant 
Constant. 
L 
18 and 19 
New-born young, 3 
hours in pouch 
Constant 
Constant. 
M 
| 
24 (younger), 
25 (older) 
Young about 3 months 
after birth 
Constant 
Constant. 
* In these cases I have definite proof that the animals were identical, 
and it is very probable that this was also true of the remainder. 
commences, and this growth is noticeably increased after the 
corpus luteum is fully formed — a stage which Sandes has 
found characterised by the presence of plentiful lutein 
granules in its cells. The growth in both cases follows a fairly 
parallel course; that of the mammary glands reaches its 
maximum in No. 10 and ceases at No. 15, while the 
height of growth activity in the corpus luteum occurs in 
No. 9, and it ceases somewhere about No. 12. Then 
follows a period during which both structures remain practi- 
cally constant, although there is the mechanical increase in 
