182 Trans. Acad. Scr. of St. Louis 
other. The following data, gathered at odd times among other 
tests, substantiate the electric fan experiments. 
On the evening of May 5 the temperature was from 58 to 
64 F. There were four males (polyphemus) in separate cages 
and 5 females in another cage side by side on the table. No 
contrivances for artificial wind, heating or lighting were used, 
excepting the ordinary electric lighting which illuminated the 
whole room. I merely watched to see if any of them seemed 
to be influenced by the activity of one, or to imitate it. Now 
when the males become active in these secreen-wire cages, the 
vibration of the wings against the mesh creates a humming 
which is almost musical, and loud enough to be heard from the 
floor below; the motion of their wings can certainly be seen by 
their near neighbors, it is probable that the motion of the air 
thus caused could be felt for a short distance, and lastly, the 
beating of the wings must stir up and disseminate the odor from 
their bodies which the others should be able to perceive. In 
short, it seems reasonable to think that one of these moths 
might become aware of his neighbor’s activity through sound, 
sight, odor or touch. 
Male 5, age 2 days, became active at 8:00 p. 
Male 4, age 2 days, became active at 9:10 p. 
Male 2, age 5 days, became active at 11:05 p. 
Male 3, age 5 days, became active at 11:30 p. 
BREE 
Each of these remained active for five to ten minutes, and 
then stopped. Thus each conducted his own affairs without 
the slightest consideration of the dictum ‘‘everybody’s doing it.”’ 
The five females in an adjacent cage showed no response what- 
ever. : 
One sees much variation in the duration and strength of the 
activity of the individuals in their cages. The activity of groups 
is in great measure regulated by weather conditions. Cool 
periods, especially in the early months, cause long periods of 
lethargy, while warm days call forth periods of activity. It 1s 
not surprising that the females are much less active than the 
males, in both frequency and strength of movement. For two 
weeks I made careful note of two polyphemus females, and found 
them almost never moving from the very spot where they were 
placed on the wires, where they clung with great tenacity. Dur- 
