132 
Psyche 
[April 
Table I Datana perspicua 
Vibration 
Water 
Shellac 
Procain 
512 
— 
— 
— 
728 
slight 
— 
slight 
512 
— 
— 
— 
728 
— 
— 
— 
512 
— 
— 
— 
728 
— 
— 
— 
512 
— 
— 
— 
728 
— 
— 
— 
512 
— 
— 
— 
728 
— 
slight 
— 
Control 
+ + 
Table II Datana ministra. 
+ 
Vibration 
Normal 
Water 
Shellac 
512 
+ 
— 
— 
728 
+ 
— 
— 
512 
+ 
— 
— 
728 
+ 
— 
— 
512 
+ 
— 
— 
728 
+ 
— 
— 
512 
+ 
— 
— 
728 
+ 
— 
— 
512 
+ 
— 
— 
728 
+ 
— 
— 
Discussion. 
The results of these experiments are startling. In only three 
were even slight responses elicited after treatment. That the 
responses are actually due to the sound is evident from the fol- 
lowing facts: the response of normal larvae is given when the in- 
sects are protected from all air currents, it can be elicited when 
the larvae are several feet away from the source of the sound, it 
was given to any one of three different musical instruments, and 
