THE MENSTRUAL CYCLE 
63 
Oestrus Cycle. 
Pro-oestrum 
TABLE III. 
Menstrual Cycle. 
Oestrus 
(Metoestrum) 
Dioestrum 
Pro-oestrum 
Oestr 
us 
I. 
2 
3 - 
4 
- 5 
6 
7 
8 
9 - 
- 10 - 
11 
12 
13 
14 
15 
16 
17 
18 
19 
20 
- 21 - 
- 22 - 
23 
24 
25 
26- 
27- 
28 
II. 
2 - 
3 - 
4 
- 5 
6 
7 
8 
9 - 
10 
- Menstruation. 
— Period of Repair. 
Period of Rest. 
— Period of Swelling:. 
■Period of Degeneration. 
— Period of Repair. 
Appearance of Discharge. 
Cessation of Discharge. 
Proliferation. 
Congestion. 
Increase of Vessels. 
Breaking down of Vessels. 
Formation of Lacunae. 
Rupture of Lacunae. 
Appearance of Discharge. 
Cessation of Discharge . 
Table similar to No. II illustrating the division of the menstrual cycle of the human 
female and its homology to the oestrus cycle of a polyoestrous mammal unaffected by 
pregnane}', modified from Heape. The chronological division of the cycle is founded on 
that of Milnes-Marshall, 1893. The complete cycle is shown extending from the 10th day 
of one lunar month to the 10th day of the next. 
