Yerkes, The Sense of Heating in Frogs. 299 



TABLE III. 



Hearing of Green Frog in Air and Under Water. 



Female. Dec. 5, 1904. 

 Weight for tactual stimulus 5 grams. 



ingfrom 100 to 1000 vibrations per second; electric bell with 

 metal gong and also with wooden gong ; sudden hammer blowj 

 Galton whistle ; Appunn whistle, and a variety of sounds pro- 

 duced by the human vocal organs. 



The sound of the electric bell produces the most marked 

 modification of reaction, probably because it consists, hke the 

 induced electric shock, of a rapid succession of stimulating 



