1907.] Torelle, Fertilization of Eggs of Asterias cmd Arhacia. 119 
TABLE IV. 
Asterias' Eggs and Sperm. 
Per c«nt 
Alcohol. 
Time 
immersed. 
Per cent, 
divided. 
Per cent. 
Ether, 
Time 
immersed. 
Per cent, 
divided. 
Per cent. 
NH4 CI. 
Time 
immersed. 
Per cent, 
dfvided. 
5 
1 min. 
50 
.5 
1 min. 
75 
.1 
1 min. 
25 
8 
50 
.7 
1 " 
50 
.1 
10 " 
0 
9 
1 '* 
40 
2 
1 " 
50 
.1 
20 " 
0 
10 
1 " 
25 
5 
1 " 
0 
.1 
30 " 
0 
11 
1 " 
20 
12 
1 ' ' 
0 
5 
10 " 
25 
.5 
10 " 
75 
.5 
1 " 
0 
8 
10 " 
1 
.7 
10 " 
50 
.5 
10 " 
0 
9 
10 " 
1 
2 
10 " 
25 
.5 
20 
0 
10 
10 " 
0 
5 
10 " 
0 
.5 
30 *' 
0 
11 
10 " 
0 
12 
10 " 
0 
5 
20 " 
0 
.5 
20 " 
70 
8 
20 " 
0 
.7 
20 " 
33 
9 
20 " 
0 
2 
20 " 
1 
10 
20 " 
0 
5 
20 " 
0 
11 
20 " 
0 
12 
20 " 
0 
.5 
30 " 
50 
.7 
30 " 
20 
2 
30 " 
0 
5 
30 " 
0 
for ten and twenty minutes. Among the eggs fertilized after an 
immersion of ten minutes, abnormal division occurred from the 
1%, 2%, and 5% ether solutions. Of those fertilized from the 
8% and 9% alcoholic solutions, 75% were abnormal, although 
more than 75% divided. Very few divisions occurred from the 
10% and 11% solutions, but abnormalities were conspicuous 
among those that did divide. From the 12% solutions, only about 
5% of the eggs divided, and all abnormally. In most cases, the 
protoplasm became merely constricted. The eggs fertilized by 
spermatozoa immersed for twenty minutes were more abnormal 
than those fertilized after ten minutes, and a smaller per cent 
divided. Eggs developed to the morula stage from 1% and 2% 
