EFFECTS OF A DIET OF RICE ON PARAMECIUM. 



59 



juice, and a fourth in two drops of distilled water and one drop 

 of I per cent, orange juice. 



The work was carried on for eleven days, at the end of which 

 time averages were made from the rates of division in each group. 

 The two control groups showed the influence of different degrees 

 of concentration upon the division rate, and the group in orange 

 juice and water was used to determine whether or not orange 

 juice served alone as an adequate food substance. Results are 

 shown in the accompanying tables. 



TABLE IV. 



THE DAILY RATE OF DIVISION. 



(a) 2 drops of distilled water and i of malted milk. 



(&) I drop of distilled water and 2 of malted milk. 



(c) i drop of distilled water and i of malted milk, and i of orange juice. 



(d) 2 drops of distilled water and i of orange juice. 



The small variations in division rate are within the limits of 

 experimental error, with the exception of group (d). From 

 these facts it is to be concluded that orange juice is not an ade- 

 quate food substance, that it does not increase the metabolic 



