438 TOKUYASU KUDO 



libitum, together with 5 to 15 grams of whole milk daily. One 

 control rat (K5.2) was fed wdth maize (Indian corn) with milk and 

 water. These grew normally up to the ages indicated in table 1. 

 The test rats (held at nearly constant body weight) were vari- 

 ously fed as follows: 



1 . Twenty rats (including all the test rats except those specified 

 below) were fed with dry 'dog-biscuit' ad libitum. They con- 

 sumed an average of about 3.7 grams daily. The amount of milk 

 fed daily decreased from about 3.5 to 4 grams at first to less than 

 2 grams after three or four weeks. In experiments extending 

 more than a month, however, it was necessary to increase the 

 amount of milk again to 2.5 or 3 grams daily. Feces averaged 

 about 0.8 gram daily throughout the experiment. 



2. Five rats (K14.5, K14.9, K10.9 K13.3 and K10.8) were 

 fed with crushed maize. Each rat consumed daily about 3.5 

 grams. The amount of milk fed decreased from about 3.5 to 4 

 grams daily at first to about 1 gram after three or four weeks. 

 The feces averaged 0.7 gram daily. 



3. Two rats (K14.4 and K14.3) were fed with a mixture of 

 crushed maize and 'dog-biscuit.' They ate about 3.6 grams 

 daily of that mixture and were fed about the same amount of milk 

 as in (2). The feces averaged about 0.8 gram daily. 



4. Two rats (K11.3 and K12.1) were fed with milk powder 

 ('Klim' brand). They consumed a daily average of about 3.4 

 grams of the dry powder. In addition fresh whole milk was fed, 

 decreasing from about 5 grams at first to less than 2 grams after 

 a month. 



5. One rat (K14.2) was fed with dried polished rice. It daily 

 ate 3.8 grams of rice throughout the experiment and passed an 

 average of 0.7 gram of feces. At first, milk was added to the 

 diet as follows. In the first two w^eeks of the test the rat was fed 

 milk in amounts decreasing from 1.8 to 0.7 gram daily; then for 

 about three weeks with 0.5 to 0.1 gram of milk daily. In the final 

 period of four weeks the rat was fed with dry rice only. In that 

 period the body weight was reduced from 33.5 grams to 27.1 

 grams. This rat was very active and showed no evident symp- 

 toms of vitamine deficiency. 



