75 
These results show that the thyroids with the higher percentages 
of iodine were more active in diminishing the resistance of rats to 
acetonitrile than was that with the lowest percentage. One-half 
of a milligram of thyroid containing 0.11 per cent iodine was nearly 
as active as a milligram of thyroid with 0.085 per cent iodine. 
Series II. 
Various amounts of the thyroid of several different animals with 
different percentages of iodine were fed in this series. The total 
amount of iodine fed did not vary greatly and the physiological 
effects were not very different. 
A. DOG THYROID; 0.104 PER CENT IODINE. 
Date. 
Weight 
of rat. 
Remarks. 
1907. 
July 6 
124 
Feeding of cakes each containing 0. 0035 gm. thyroid commenced. 
8 
123 
11 
120 
15 
119 
17 
118 
Acetonitrile, 94.4 mgms., i. e., 0.8 mgm. per gm. rat. Survived. 
July 6 
107 
Thyroid as aboye. 
8 
104 
11 
100 
15 
98 
17 
98 
Acetonitrile, 98 mgms., i. e., 1 mgm. per gm. rat. Died 3 hours. 
July 6 
73 
Thyroid as above. 
8 
70 
11 
68 
15 
64 
16 
63 
Acetonitrile, 81.9 mgms., i. e., 1.3 mgms. per gm. rat. Died about3 hours. 
July 6 
79 
Thyroid as above. 
8 
77 
11 
74 
15 
68 
16 
70 
Acetonitrile, 126 mgms., i. e., 1.8 mgms. per gm. rat. Died 3^ hours. 
B 
. SHEEP THYROID; 0.176 PER CENT IODINE. 
1907. 
July 6 
122 
Feeding of cakes each containing 0.002 gm. thyroid commenced. 
8 
119 
11 
114 
15 
105 
16 
105 
Acetonitrile, 94.5 mgms., i. e., 0.9 mgm. per gm. rat. Survived. 
July 6 
106 
Thyroid as above. 
8 
106 
11 
104 
15 
101 
17 
102 
Acetonitrile, 102 mgms., i. e., 1 mgm. per gm. rat. Survived. 
July 6 
73 
Thyroid as above. 
8 
69 
11 
66 
15 
62 
17 
64 
Acetonitrile, 76.8 mgms., l. e., 1.2 mgms. per gm. rat. Died hours. 
July 6 
76 
Thyroid as above. 
8 
71 
11 
70 
15 
68 
16 
68 
Acetonitrile, 102 mgms., i. e., 1.5 mgms. per gm. rat. Died 4 hours. 
