No. 636] SHORTER ARTICLES AND DISCUSSION 77 

 Period No. 2. Diet 403 and (or) 405 (Limited) 



In order to make more easily comparable the weight changes 

 with food intake in the two periods, table No. 3 is presented. 



The ener«?y content of the excreta during the two periods was 

 not determined, but Hopkins" and Drummond^=^ have shown that 

 the energy eontont of the excreta of rats when fed adequate 

 foods is substantially the same as when fed vitamine-free foods. 



The writer regrets the inability to repeat the work with a 

 larger number of animals. It would be desirable to use a 

 vitamine extract, control the temperature of the animal room, 



the 



lual 1 



nd to 



. Physiol, 1912, 



