166 Trans. Acad. Sct. of St. Louts 
At 10:50, male No. 18 flew to cages 5, 3, 2 respectively, and 
then flew away. After a few minutes he returned and flut- 
tered again, this time stopping at cages 2, 5, 4, 2, and then a 
second time flew away; returning a third time he flew to cage 
2 and soon settled down to remain there. 
At 11:30 p. m., male No. 33 flew to the roof and fluttered 
for several minutes each at cages 4, 5 and 6, and then flew 
away; returning he examined cage 4 again and soon settled 
down to remain there. 
At midnight eecropia No. 54 appeared and fluttered about 
cage 6, then 5 and flew away; for some minutes he fluttered 
about neighboring roofs-and then came back as if following 
a new trail and alighted on cage 2 where he remained. 
At 12:50 a. m., male No. 303 examined cages 6, 5, 4 and 3, and 
finally chose 4. 
Between 1:00 and 1:05 three males came but flew to the 
brick wall, to a cranny under the third floor guttering, where 
they behaved as though they were looking for something, and 
then flew away. Closer examination revealed that the breeze blew 
from the cages toward the wall where the air was caught in this 
pocket or nook under the guttering. The males probably con- 
gregated where they found the odor, although they were de- 
ceived as to the location of the females. 
At 1:20 male No. 52 fluttered about cage 5, then flew away; 
returning presently he went to the same cage again and alighted 
there. 
At 3:22 a wild male fluttered for a long time about cage 2 
and finally settled on cage 1; a few minutes later another sim- 
ilarly examined cage 1 and eventually rested permanently on 
2 
eage 
Experiments to Test Reaction to Light. 
We have seen in the previous experiments testing the percep- 
tion of odor that reaction’ to odor stimulus occurs only when 
wind is present to convey it. These experiments have shown 
also that when moths have been aroused to activity by odor of 
the opposite sex, they react usually not to the individuals of 
the opposite sex directly, but fly to the light, even though they 
must pass their mates to go there. . 
