26 



A. YASUDA. 



; The examination of each culture was made at the end of 1-5 days, 

 wa& repeated several times, and every time carefully compared with the 

 control-culture. 



Colpidium colpoda. 



\w milk-sugar solution the organism was found to survive in 1- 

 10% concentrations. In 1-2% solutions nothing remarkable was 

 observed, but in a 4% solution the vacuoles increased in size and the 

 body enlarged itself and became somewhat rounded. In solutions above 

 6% the vacuoles greatly enlarged and increased in number, giving the 

 body of the organism an extremely plump appearance. 



In the case of cane-sugar the organism survived in 1-8% solutions. 

 In a 3% solution the vacuoles became larger and the body began to be 

 rounded. In solutions above 5% these changes were more noticeable. 



In grape-sugar it survived in 1-7 % solutions, and behaved much as 

 in the preceding medium. 



In glycerineit was found to survive in 1-5% solutions, changes like 

 the last being produced by solutions of 3% and stronger. 



In common salt it survived up to \% solution. 



Chilomonas paramcecium. 



The organism survived in 1-8% milk-sugar solutions. In a 4% 

 solution the corpuscles became larger and the body increased both in 

 breadth and thickness while it rather decreased in length. In an 8% 

 solution these changes were the most remarkable. 



Of the 1-7% cane-sugar solutions in which it could survive, those 

 above 3% produced changes on its body like those caused by milk-sugar. 

 This organism seemed to adapt itself well to 1-6% grape-sugar, 1-4% 

 glycerine, and T VHr% common salt. 



Euglena viridis. 



Solutions of 1-17% milk-sugar, 1-13% cane-sugar, 1-11% grape- 

 sugar, 1-5% ? glycerine, and more than 2% common salt were found to 



