1900-1.] Dr J. Y. Simpson on Binary Fission of Ciliata. 413 
Date. 
Temperature. 
Slide. 
Individuals. 
Kumt 
Biparti 
In 24 hours. 
>er of 
tions. 
Total. 
June 28 
23° 
a 
26 
1 
5 
c 
7 
0 
5 
f 
20 
0 
6 
27 
] 
7 
h 
18 
1 
5 
T 
11 
1 
5 
„ 29 
23 
a 
45 
1 
6 
c 
9 
0 
5 
f 
27 
0 
6 
§ 
42 
1 
8 
h 
25 
0 
5 
T 
16 
1 
6 
„ 30 
23 
a 
53 
0 
6 
c 
14 
1 
6 
f 
34 
0 
6 
g 
46 
0 
8 
h 
38 
1 
6 
q 
23 
0 
5 
July 1 
22 
a 
90 
1 
7 
c 
28 
1 
7 
f 
60 
1 
7 
g 
77 
1 
9 
h 
54 
1 
7 
i 
q 
23 
0 
1 6 
The numbers on the first five slides 
were reduced 
to 43, 9, 13, 
14, and 7 
respectively. 
July 2 
20 
a 
64 
1 
8 
c 
18 
1 
8 
f 
16 
0 
7 
Cf 
28 
1 
11 
h 
12 
1 
8 
q 
27 
0 
5 
z 3 
18 
a 
99 
1 
9 
c 
23 
0 
8 
f 
20 
0 
7 • 
£) 
51 
1 
12 
h 
15 
0 
8 
q 
34 
0 
5 
„ 4 
18 
a 
99 
0 
9 
c 
25 
0 
8 
f 
30 
1 
8 
8 
51 
0 
12 
h 
15 
0 
8 
q 
34 
0 
1 
5 
Here, then, in a period of three weeks, with a temperature 
ranging from 16° to 24° C., there is, over six slides, an average 
of eight divisions. This series was by no means the first that 
I inaugurated, and the slides were numbered from a to r. The 
