EFFECTS OF A DIET OF RICE ON PARAMECIUM. 



TABLE VII. 



TOTAL OF DIVISIONS IN EACH GROUP AND AVERAGES. 



6i 



The experiments with rice and orange juice were begun May 6, 

 by isolating four individuals from Lines A, B, C and D, two as 

 controls in two drops of distilled water and two drops of i per 

 cent, rice water, from polished and unpolished rice respectively, 

 and two like the controls with the addition of one drop of I per 

 cent, orange juice to each. The work was carried on for eleven 

 days at the end of which time averages were made of the rates 

 of division in each group, to determine whether or not the 

 substitution of the accessory food substances in' orange juice for 

 the rice vitamin had increased the metabolic activities of the 

 individuals in polished rice, and also to note any stimulus to 

 division produced by the addition of orange juice to unpolished 

 rice. The results are shown in the accompanying tables. 



It is evident from these results that all of the Paramecia were 

 in a state of depression which was not altered to any appreciable 

 extent by the presence of orange juice, although the individuals 

 in unpolished rice and orange juice seem to have had more re- 

 sistance to the unknown factors which produced dissolution in 

 the other groups. The orange juice had a slightly stimulating 

 effect upon the metabolic activities of the organisms in polished 

 rice but absolutely no effect whatever upon the division rate of 

 those in unpolished rice. From these results it may be concluded 

 that orange juice has not a powerful influence upon the meta- 

 bolic activities of Paramecium. 



Much appreciation is due Dr. Florence Peebles for her helpful 

 supervision of this work. 



