TABLE XL 



(Combined results of Tables IX and X.) 

 Rats from mothers on Diet 13 and 13 M. 



11 100 25 45 59 81 96 113 129 141 145 151 106 



12 



11 101 30 46 62 88 108 129 147 161 172 179 133 " 12 



K. = killed. D. = died. 



(1) 27 gms.=average weight at death. 

 66 days=average age at death. 



(2) 33 gms.=average weight at death. 

 68 days=average age at death. 



(3) 8 rats D. in 69, 68, 63, 53, 75, 73, 69, 67 days. 

 2 rats K. at 12 weeks. 



(4) 6 rats D. at 65, 61, 75, 82, 72, 72 days. 

 4 rats K. at 12 weeks. 



(5) 3 rats D. at 74, 74, 77 days. 

 8 rats K. at 12 weeks. 



The greatest difference in rate of growth for a difference 

 of 5 per cent, in the amount of milk contained in the diet, is 

 found between 20 and 25 per cent. Obviously then the ration 

 containing 25 per cent, of skimmed milk powder is the proper 

 one to use in a study of the change in the water soluble B 

 content of skimmed milk powder upon heating. 



A study of Tables IX and X further shows a decided dif- 

 ference between the animals from the two sources. Rats from 

 mothers on Diet 13 M grew faster and maintained a higher 

 average weight than the animals from mothers on Diet 13 

 alone. The young rats from Diet 13 M are evidently more 

 vigorous and therefore make better growth. The data shows 

 that it is essential either to use rats coming from mothers on 

 the same diet or to take the same number of rats from each 

 diet in making up matched lots of rats for comparison. 



A typical experiment will suffice to show the variation 

 among the individual animals on the same diet. The average 



17 



