1900-1.] Dr J. Y. Simpson on Binary Fission of Ciliata. 411 
Date. 
Temperature. 
Slide. 
Individuals. 
Numl 
Biparti 
In 24 hours. 
ber of 
tions. 
Total. 
June 13 
16° 
a 
2 
0 
0 
c 
2 
0 
0 
f 
2 
0 
0 
a 
o 
Pair still in conjugation. 
h 
>: 
> Si 
<1 
„ 14 
16 
a 
4 
1 
1 
c 
3 
1 
1 
f 
4 
1 
1 
g 
2 
0 
0 
h 
2 
0 
0 
q 
Pair 
in conjugation. 
„ 15 
17 
a 
4 
0 
1 
c 
4 
0 
1 
f 
4 
0 
1 
g 
2 
0 
0 
h 
4 
1 
1 
q 
2 
0 
0 
An increase in size was apparent in the case of a and g. 
June 16 
20 
a 
5 
0 
1 
c 
4 
0 
1 
f 
7 
1 
2 
cr 
2 
0 
0 
h 
4 
0 
1 
q 
2 
0 
0 
„ 17 
21 
a 
8 
1 
2 
c 
6 
1 
2 
f 
11 
1 
3 
or 
O 
2 
0 
A 
V 
h 
8 
1 
2 
q 
3 
1 
1 
,, 18 
23 
a 
10 
0 
2 
c ' 
8 
0 
2 
f 
22 
1 
4 
g 
3 
1 
1 
h 
11 
0 
2 
q 
3 
0 
1 
>, 19 
21 
a 
13 
0 
2 
c 
30 
0 
2 
f 
31 
0 
4 
g 
5 
1 
2 
h 
21 
1 
3 
q 
5 
1 
2 
„ 20 
20 
a 
16 
0 
2 
c 
15 
1 
3 
f 
32 
0 
4 
g 
8 
1 
3 
h 
27 
0 
3 
q 
7 
0 
2 
