48 
Table VI I . -Determination of the time required to stop the isolated heart of Rana pipiens 
with Ringer's solution to which digitalis had been added to make the solution of 1 per cent 
tincture strength. 
Minutes. 
Mulford No. 2 23 
26 
21 
21 
18 
22 
14 
15 
15 
16 
21 
18 
Average 19 
Merrell .31 
35 
17 
35 
37 
34 
21 
35 
Average 31 
B. W. and Co 19 
30 
29 
21 
26 
17 
18 
Average 23 
Lloyd Bros 66 
71 
54 
48 
46 
Average 57 
Digitalone No. 3 53 
47 
78 
65 
97 
72 
Average 69 
N. B. and Co 
Average 
H. B. and W 
Minutes. 
18 
28 
19 
20 
16 
21 
17 
15 
21 
23 
16 
18 
Average 
P., D. and Co 
20 
32 
12 
33 
44 
26 
12 
16 
19 
22 
26 
Average 
24 
S. and D 
29 
27 
25 
32 
26 
32 
29 
20 
Average 
28 
SUMMARY. 
Preparation. 
Minutes. 
H. B. and W 
18 
Mulford No. 2 
19 
N. B. and Co . 
20 
B. W. and Co 
23 
P., D. and Co . . 
24 
S. and D . 
28 
Merrell 
31 
Lloyd Bros 
57 
Digitalone No. 3 
1 
69 
