160 Trans. Acad. Sct. of St. Louis 
there was no movement or any other indication that they were 
aware of it, just as in the previous experiment. 
A cage of ten females from one to two days old was gently 
inserted between the males and the fan; after five minutes, 
six males were opening and closing their wings. After a few 
minutes, four of these relaxed and only two remained active, 
one of which escaped and flew out the open door. Not content 
with the slowness of their response to the magnificent treat 
which I was offering them, I suspected that through poor tech- 
nique much of the odor was missing the mark, or more likely, 
was being carried through the cage of the males too quickly. 
Therefore I built a wall of books and boxes behind and beside 
the cage, so this air could be retarded and would accumulate. 
Two minutes after this change was made, several of the moths 
began to vibrate their wings, and five minutes after the wall 
was done, five males were beating their wings in intense excite- 
ment, and all were struggling against the side of the cage facing 
that of the females. Of course, it appeared that they were 
pushing their way toward the source of their excitement, but 
we must consider also that the window was in that direction, 
so it may well be that, after having been aroused by the odor 
stimulus, they were struggling to go toward the light, as the 
moths did in similar circumstances in the glass box. After 
seven minutes of this arrangement, six were active; after 13 
minutes, eight were excited, and since no more of the 18 showed 
signs of responding, the experiment was concluded. Thus re- 
tarding or piling up the tainted air caused eight to become 
violently active, whereas in the first part of the experiment, six 
(four of which soon relaxed) made only a languid response. 
Exp. 7. This is really a continuation of Exp. 6, excepting 
that the sexes were reversed in their, position before the fan. 
Heretofore the females had always been so placed that they 
received only the pure air direct from the fan, untainted by 
male odors. The reactions of the females, when the pure air 
passed through their cage, was exactly the same as it was 
for the males under similar conditions. Their only reaction, 
if it might be called such, was to cling the more tenaceously to 
the meshes of the cage. The wind often pushed a wing to one 
side, but there was no voluntary response on the part tf 
single female to a current of pure air. 
