E. B. Hart and H. Steenbock 323 
a" | PLATE 3. 
Fig. 2. The same sow that produced the pigs shown in Fig. 1. On the 
same ration,—33 parts of corn, 33 of oats, 33 of clover,—but fortified with 
10 gm. of potassium iodide per 100 pounds of feed, a normal litter was 
produced. 
Fig. 3. Reared on a ration of low protein and comparatively high 
roughage content, 75 parts of corn, 25 of alfalfa. The iodine content of 
this ration was not unlike that of the ration which produced the results 
shown in Fig. 1; the two rations, however, differed in their protein and 
roughage content and in this case the low protein diet was consumed dur- 
ing the life of the animal, including the growing period. 
THE JOURNAL OF BIOLOGICAL CHEMISTRY, VOL. XXXIII, NO. 2 
