104 Trans. Acad. Sct. of St. Louis 
the laboratory, were liberated one mile west at 11:48 p m. Seven 
of these successfully made the one-mile flight, 4 of them coming 
in on the first night and 3 on the second. The first ones ar- 
rived in 8, 25, 32 and 82 minutes; those on the following night 
arrived at 1:10, 4 and 4:10 a. m. It is interesting to note that 
it was possible for one moth to make the flight of a mile in 8 
minutes; in fact, he got home before I did, and my son had him 
eaught and properly recorded when I arrived. And this moth 
had never been out of doors before and was only one day old 
when liberated! 
Exp. 32. May 26. Wind, east; station, 1 mile west. This 
test was precisely the same as the last, excepting that wild males 
which had flown -to the laboratory only that morning at dawn 
were used. They were 15 in number, and were liberated at 
11:45 p.m. Five returned at the following times: 12:03, 1:12, 
1:22, 1:55 and 2 a. m. Thus the sprightliest of these made 
almost as good time as a human competitor. 
In the preceding four experiments it is evident that some of 
the male cecropias came in at hours that differ greatly from their 
regular hour of dawn. These were undoubtedly influenced by 
the light of the moon, but an analysis of the data in a later 
chapter shows that the bred males are more subject to this influ- 
ence than the native ones. 
Exp. 33. May 27. During the dawn, in addition to the 
marked cecropias which returned, 58 wild ones came in, of which 
47 appeared young and 11 old. 
Exp. 34. May 27. Wind, east; station, 134 miles west. 
Twelve unmated bred males, from 26 to 30 hours old, were 
liberated in or near the path of the wind, at 10:50 p.m. Two 
came in that night at 12:01 and 12:18 a. m., one each at dawn 
of the third day and fourth day thereafter. The first two made 
the distance of 134 miles in the brief time of 114 and 1% hours. 
Exp. 35. May 27. Wind, east; station, 134 miles west. All 
conditions were the same as the last, excepting that experienced 
fliers were used; these 11 cecropias had all made one test flight 
before. Three of these returned that night, the first at 12:50, 
having made the trip in two hours, and the other two at dawn. 
Here the experienced fliers did no better than the novices. 
Exp. 36. May 27. Wind, east; station, 14 mile east. Four 
