61 
From A and B it is seen that the thyroid containing 0.19 per 
cent iodine was nearly twico as actiye as that containing 0.1 per 
cent. In C and D the effects (with 0.005 gm. thyroid in each cake) 
were apparently maximum in each case, so that no difference in 
the activity of the two preparations was apparent. 
Series V. 
A series very similar to the above is the following: 
A. SHEEP THYROID; 0.1 PER CENT IODINE. 
Date. 
W eight 
of mouse. 
Remarks. 
1908. 
« 
February 11 
22.99 
Feeding of cakes each containing 0.001 gm. thyroid commenced. 
* 14.... 
21.66 
17.... 
22.07 
20.... 
2L 61 
21.... 
21.74 
Acetonitrile, 34.78 mgms., i. e.. 1.6 mgms. per gm. mouse. Survived. 
February 11 — 
2i 06 
Thyroid as above. 
14. . . . 
2L 13 
17.... 
2L76 
20.... 
2R 94 
21.... 
2L77 
Acetonitrile, 45.72 mgms., i. e., 2.1 mgms. per gm. mouse. Died 2\ horns. 
February 11 
18.50 
Thyroid as above. 
14.... 
17.79 
17.... 
17.47 
20.... 
17.43 
Acetonitrile, 43.58 mgms.. i. e., 2.5 mgms. per gm. mouse. Died 3i hours. 
February 11 
2ft 14 
Thyroid as above. 
' 14.... 
17.48 
17... J 
17.81 
20.... 
17.45 
Acetonitrile, 52.35 mgms., i. e., 3 mgms. per gm. mouse. Died 2\ hours. 
B. SHEEP THYROIDS: 0.19 PER CENT IODINE. 
1908. 
February 11 
16.80 
Feeding of cakes each containing 0.001 gm. thyroid commenced. 
' 14.... 
16. 02 
17.... 
16.41 
20.... 
17.10 
Acetonitrile, 34.2 mgms.. i. e., 2 mgms. per gm. mouse. Survived. 
February 11 
21. 25 
Thyroid as above. 
14. . . . 
20.90 
17.... 
22.48 
20.... 
17.13 
Acetonitrile, 42.83 mgms., i. e , 2.5 mgms. per gm. mouse. Survived. 
February 11 
16.38 
Thyroid as above 
14.... 
15.29 
17.... 
15.09 
20.... 
15.17 
, 21.... 
15. 59 
Acetonitrile, 46.77 mgms., i. e., 3 mgms. per gm. mouse. Survived. 
February 11 
2L69 
Thyroid as above. 
14. . . . 
20.46 
17.... 
2L02 
20.... 
20. &4 
21.... 
20.90 
Acetonitrile, 73.15 mgms., i. e., 3.5 mgms. per gm. mouse. Died 1± hours. 
