Dixon — On the Effects of Gases on Transpiration. 623 



apparatus. The rate of evaporation, •when this cuiTent was composed 

 of air, oxygen, carbon dioxide, and largely of ether and chloroform, -was 

 observed, and is recorded in the following table. The evaporating 

 surface in each case was 41 sq. cms, : — 



Table III. 



Medium. 



Temperature. 



Evaporation in 

 30 min. 



Oxygen, 



Air, ... . 



14-7 

 14-7 



•098 grs. 

 •094 grs. 



Ether, .... 

 Air, 



15-6 

 15-4 



•074 grs. 

 •092 grs. 



Chloroform, . 



Air, .... 



18-7 

 18-3 



•077 grs. 

 •132 grs. 



CO2, .... 

 Air, ... . 



15-2 



15-1 



•096 grs. 

 •108 grs. 



From this table it results, if -we denote the loss of weight of a 

 vessel of water in air as 100, the loss in the other gases will be as 

 follows : — 



Table IY. 



^Medium. 



Specific 

 Evaporation. 



Oxygen, 



Air, .... 



CO2, .... 



Ether, .... 



Chloroform, 



104 



100 



89 



81 



59 



