158 Trans. Acad. Sct. of St. Louis 
the steady stream of air from an electric fan. These tests give 
us data on: (a) the reaction of male moths when placed before 
an electric fan, (b) the reaction of female moths when placed be- 
fore an electric fan, (c) the reaction of male moths when fe- 
male odor was blown upon them, (d) the reaction of female 
moths when male odor was blown upon them. Since each of 
the experiments gives data on more than one of the above four 
points, it is not possible to classify the work under the above 
headings, but the experiments are given in the order in which 
they were undertaken. 
Exp. 5. May 30, 12:30 p. m. A cage containing 10 male 
cecropias and one male polyphemus was placed in front of an 
electric fan, which was set to the slowest possible speed to throw 
a steady flow of air. All these were native males that had come 
in with that morning’s dawn. For fifteen minutes they were 
subjected to the slow, steady stream of air from the fan. There 
was absolutely no voluntary action or reaction on the part of 
any one of the males during this period. The motion of the air 
would sometimes force a wing to one side for a moment, but 
there was no voluntary movement. The only reaction, if it may 
be so called, was that the males clung the more tenaceously with 
their tarsi to the meshes of the cage. The fan was turned off 
and they were given a rest of 15 minutes. 
When the fan was turned on again, a cage of six females, from 
one to two days old, was placed half way between the fan and 
the cage of males, in such a way that the breeze would pass 
through it before reaching the males. After just two minutes 
of the rain of this tainted air on the erstwhile motionless males, 
3 began vibrating the wings with intense rapidity, and in five 
minutes the male polyphemus was fluttering wildly about (for 
a cecropia female!) and another cecropia joined in the activity. 
During this period of ten minutes there were four other males 
which made, not a frantic demonstration, but a gentle move- 
ment of the wings up an down. There were only two which 
showed no response to this modified air, whereas a little while 
before none of the lot showed even a slight response to a breeze 
of the same intensity of pure air. When the fan was stopped, 
the moths soon became quiet; after a ten-minute rest the war: 
rent of air was renewed, very gently; this revived their activity 
and within five minutes all but one male showed some reaction 
