SEXUAL ACTIVITY OF MALE RABBITS A471 
TABLE 1—Continued 
INTERVAL | 
DATE SINCE LAST lst 5TH 10TH 157TH 20TH 
SERVICE 
Male 4 
1916 days 
6-27 0.460 0.214 0.015 
6-29 2 0.25 
7-8 9 OR212 
11l- 9 25 0.610 0.07 
12-28 11 0.1 eal 
1917 
1-10 13 0.13 
1-19 9 
6-14 17 0.09 
Male 5 
1917 
6-15 0.28 0.05 0.13 0.05 
6-28 13 0.12 0.163 0.082 
7-13 5 0.14 0.145 0.08 
INT ashes ais sats ep Reese cls ake 0.341 0.213 0.218 0.134 0.098 
Standard deviation of 
IM GANS) eps, seehsioret crcl +0.03072 0.0436 0.0593 0.0287 0.0122 
Standard deviation of 
difference of means|/+0.0533 0.0735 0.0658 0.0311 
already been pointed out, to recover the entire amount of the 
discharge, neither is it possible by the methods used to recover 
the semen free entirely from the secretions of the female genital 
tract. But there is no a priori reason to think that the amounts 
recovered are not proportional to amounts deposited. To meas- 
ure such small amounts of a thick, viscous fluid, volumetric 
methods are not feasible, and the record of amounts was, in all 
but a few cases, obtained by weighing. 
The results obtained are shown in table 1. The decrease in 
volume with advanced services shown by these figures is certainly 
not pronounced. The means from the different end services 
and standard deviations of these means are given. The stand- 
ard deviations of the differences between the means (calculated 
