162 Trans. Acad. Sct. of St. Louis 
which responded had had a longer period in which to rest. 
However, this lack of response gives us some evidence in an- 
other problem. In going over the experiments, one might ex- 
pect that activity in some cases might be due to imitation, that 
the activity of one moth in a group influences the rest to 
motion, that movement to light or odor might not be due to 
light and odor per se, but merely to sharing a neighbor’s excite- 
ment by imitation. Here we see 12 males remaining immovable, 
even in close juxtaposition to 22 very active ones. This indi- 
cates that each male asserts its prerogative of being a separate 
entity, physiologically and psychologically, and reacts only when 
he himself is ready. 
Exp. 9. In this experiment, the positions of the cages were 
reversed and the actions of the 20 females observed. When the 
pure air was passing through their cages, they made absolutely 
no response of any sort. As soon as the cages were transposed 
and the air from the males came upon them, there was a 
startled stir; for five minutes three females quivered their 
wings, then there was not further action although the breeze 
was continued for twenty more minutes. Thinking that pos- 
sibly the wild life that these males had led might have depleted 
their attractiveness, and not knowing how old they were, I re- 
moved these two cages of wild males and put in their place 
two cages containing 27 males that had emerged from their 
eocoons in the laboratory two days before. For forty minutes 
the breeze from these was blown upon the females, but not one 
would stir. Here too it is apparent that the response to stimull 
is not extraneous, but occurs only when the individual insect 
is ready physiologically. d ; 
Exp. 10. This was not a set experiment, but certain acecl 
dental discoveries were made on the wind, odor and mating 
which should be recorded here. They seem to show that wind is 
necessary for proximate as well as distant orientation ; in other 
words, even though the male is close to the female, the wind 1S 
a factor in bringing them together. oe 
On June 3, at 6 p. m., 26 wire dish covers, each containing s 
male and a female from 114 to 3 days old, were arranged on y 
table back in a corner of the room. I needed a number 0 
fertile females for another experiment, and J thought, of eee 
I could get them in this way. Mating usually oceurs ™ ©" 
