The average growth curves on these various diets were 

 practically identical and the average duration of life varied by 

 only four days. Table II briefly summarizes the results of 

 this series of experiments. 



TABLE II. 

 Summary of average results on diets 94, 102, 103, 104, 105. 



Number Average Average Average 



of initial weight age at 



Diet rats weight at death death 



94 12 47 gms. 34 gms. 61 days 



102 8 46 " 31 " 65 " 



103 8 47 " 34 " 64 " 



105 8 47 " 34 " 63 " 



104 8 46 " 33 " 62 " 



It was thought that the results might be different if vita- 

 min B were added to the diets, in other words if this vitamin 

 was not the limiting factor in the diet. At about this time in 

 the course of the work, it was also thought wise, merely as a 

 factor of safety, to replace 2 per cent, of the butter fat in the 

 diet by cod liver oil. Each rat in this comparison received 

 either diet 107, 108, 109, or 110 with an addition of 7 cc. or 

 8 cc. of reconstructed skimmed milk. These doses were used, 

 since from experiments reported later in the paper it became 

 apparent that one or the other of these amounts would prob- 

 ably give the best results in the study of the destruction of 

 water-soluble B by heat. 8 cc. was later decided upon 

 as the best dose but the results for both are here given, both 

 being valuable in this connection. 



TABLE III. 

 The following diets were used in the second comparison: 



Diet 107 108 109 110 



% % % % 



Casein 18 18 23 18 



Butter fat 8 13 8 8 



Cod liver oil 2 2 2 2 



Starch 68 63 63 67 



Salt mixture (O. & M.) 40 4445 



11 



