300 A. FRANKLIN SHULL 
TABLE 6 
Showing the number of male- and female-producers in two lines of Hydatina senta, 
the one being reared from a resting egg that remained unhatched seventy-five to 
ninety-one days, the resting egg having been obtained from inbred female of the other 
line in this table. 
ORIGINAL LINE LATE HATCHING INBRED 
Date of first | Number of o’2| Number of @ 2) Barcel fist Number of & 9) Number of 2 9 
young | young 
January | | January 
9 1 a 9 2 14 
2 16 11 6 21 
12 1 11 13 3 10 
| 1 6 0 8 
14 | 2 2 15 0 PA 
| 0 7 17 3 8 
| 0 2 1 10 
il 8 19 7 24 
18 0 3 21 1 35 
0 4 23 2 24 
21 0 2 | 25 0 21 
30 0 5 | 26 12 22 
0 2 28 15 4 
February ») | 25 
1 0 2 February | 
ee Wieseg amt - 4 oe lie 
totale set | 8 lk 58 261 
Per cent of 
CHO as: 9.4 | Se 
that the three other inbred lines recorded in the preceding experi- 
ments yielded 19.8 per cent, 16.7 per cent, and 15.4 per cent of 
male-producers respectively. 
These percentages are so nearly equal that, on the whole, it 
seems pretty certain that there isno connection between the length 
of time spent in the resting egg, and the proportion of male-pro- 
ducers. 
It may be pointed out incidentally that in the entire original 
line, including 38 generations previous to the seven recorded in 
table 6, but excluding those not recorded in full, the average size 
of family was 26.3, while the average size of family in the late 
