102 
Series IV. 
In this series equal amounts of tlie thyroid of Groups 2 and 1 (nor- 
mal) and of Group 5 (iodoform fed dogs) were compared. 
A. THYROID OF GROUP 2 (NORMAL); 0.111 PER CENT IODINE. 
Date. 
Weight 
of mouse. 
Remarks. 
1908. 
May 0 
13.83 
Feeding of cakes, each containing 0.0005 gm. thyroid, commenced. 
16 
12.49 
18 ! 
11.76 
Acetonitrile, 12.94 mgms., i. e., 1.1 mgms. per gm. mouse. Survived., 
May 9 
18.52 
Thyroid as above. 
16 
18.43 
18 
18.29 
Acetonitrile, 26.61 mgms., i. e., 1.4 mgms. per gm. mouse. Died 5 hours. 
May 9 
18.48 
Thyroid as above. 
16 
19.00 
17 

Acetonitrile, 34.2 mgms., i. e., 1.8 mgms. per gm. mouse. Died 2 hours. 
May 9 
14. 98 
Thyroid as above. 
16 
12.80 
17 
Acetonitrile, 32.0 mgms., i. e., 2.5 mgms. per gm. mouse. Died 3 hours. 
B. 
THYROID OF GROUP 1 (NORMAL); 0.129 PER CENT IODINE. 
1908. 
May 9 
16. 17 
Feeding of cakes, each containing 0.0005 gm. thyroid, commenced. 
15 
16. 84 
18 
16.71 
! Acetonitrile, 26.74 mgms., i. e., 1.6 mgms. per gm. mouse. Survived. 
May 9 
11. 50 
Thyroid as above. 
15 
12.67 
16 
12.46 
18 
12. 59 
Acetonitrile, 22.62 mgms., i. e., 1.8 mgms. per gm. mouse. Survived. 
May 9 
15. 87 
! Thyroid as above. 
15 
15. 17 
16 
14.87 
17 
Acetonitrile, 31.23 mgms., i. e., 2.1 mgms. per gm. mouse. Died 1J hours. 
May 9 
15.71 
Thyroid as above. 
15 
14.61 
16 
14.58 
17 
Acetonitrile, 36.45 mgms., i. e., 2.5 mgms. per gm. mouse. Died 1| hours. 
C. 
THYROID OF GROUP 5 (IODOFORM); 0.3 PER CENT IODINE. 
1908. 
May 9 
21.46 
Feeding of cakes, each containing 0.0005 gm. thyroid, commenced. 
16 
19. 13 
18 
19. 15 
Acetonitrile, 55.54 mgms., i. e., 2.9 mgms. per gm. mouse. Survived. 
May 9 
14.50 
Thyroid as above. 
16 
13.39 
17 
! Acetonitrile, 41.51 mgms., i. e., 3.1 mgms. per gm. mouse. Survived.. 
May 9; 
16. 12 
Thyroid as above. 
16 
15.02 
18 
15. 05 
Acetonitrile, 49.66 mgms., i. e., 3.3 mgms. per gm. mouse. Died 2i hours. 
May 9 
14.26 
Thyroid as above. 
16 
12.25 
Acetonitrile, 42.88 rngms; i. e., 3.5 mgms. per gm. mouse. Died 4| hours. 
