EFFECTS OF A DIET OF RICE ON PARAMECIUM. 



57 



polished rice as a diet for young rats McCollum and Davis found 

 it necessary to supplement the diet with water-soluble and fat- 

 soluble vitamines. They found that 2 per cent, skim milk 

 powder in combination with the rice supplied nearly enough 

 water-soluble B for normal growth. In the experiments with 



TABLE III. 



4-a 



Tlu. -m.be.rs of 



GRAPH SHOWING DAILY TOTAL FOR EACH GROUP. 



Crosses indicate divisions of individuals in malted milk. The dotted line indi- 

 cates divisions of individuals in unpolished rice. The continuous line indicates 

 divisions of individuals in polished rice. 



Paramecium the addition of one drop of I per cent, malted milk 

 solution to one drop of I per cent, polished rice water and two 

 drops of distilled water restored the division rate to the normal 



