24 



Conclusions : — 



1) Isotonic solutions of the chemical compounds in question do not 

 produce corresponding effects upon the bodies of infusoria. The action 

 depends more upon the chemical nature of each substance than upon it- 

 concentration. 



2) In solutions of higher concentration a contraction of the bodies 

 takes place, which disappears after some hours, when the organisms 

 begin to accommodate themselves to the new media. 



3) Higher concentration of the medium retards the multiplication 

 of the organisms. 



4) As the concentration of the medium increases, the movement of 

 the organisms is retarded. 



5) In sugar-solutions of higher concentration some infusoria seem 



6) The vacuoles or the corpuscles increase in diameter as the 

 concentration of the medium becomes stronger. 



7) The more the concentration of the medium increases the more 

 rounded become the organisms. 



Botanical Institute, College of Science, 

 Imperial University, Tokyo, Japan. 

 March, 1897. 



