108 Trans. Acad. Scr. of St. Louts 
of moths of various histories. Of the 12 wild ones caught that 
morning, 4 returned (33 per cent) ; one came in the following 
dawn, 6 hours after liberation, one the morning of June 3, and 
two at dawn of June 4. However, only one came in at once, 
and the others wandered for two or three nights. Of the 10 
caught the day before, 3 came in (also 30 per cent), but none the 
first night, two the second and one the third dawn. Of the 7 
moths which had already flown to the roof twice (once volun- 
tarily and once under test), just one returned, an hour and 
forty minutes after being set free at 10 p.m. Of the 31 bred 
males, one day old, 6 (near 20 per cent) came back, and, the 
more surprising, all the first night; the first ones came in at 
10:50, 11:40, and 11:45, and the other three at dawn. This 
appears to be the most remarkable record yet established; for 
it is truly wonderful that so many moths should come back 
promptly from a distance of three miles, when mates must have 
been abundant in the very park where they were liberated. And 
last, but not forgotten, is our one bred moth, four days old, 
which distinguished itself by coming back in two hours and 
three minutes, in spite of its youth and inexperience; it, too, 
made the three miles without waiting for the customary hour 
of dawn. This makes 4 of the 15 which came in before their 
customary hour of flight. It is highly interesting to note that 
all which came in during the early hours of the night returned 
during the first night; those which came on following nights all 
came at dawn. There must be a reason; were the meteorological 
conditions during the early hours of the night of June 1-2 more 
favorable than those of the two nights following, or were these 
particular creatures which came in early endowed with finer 
sensitiveness or superior ability which enabled them to surpass 
their fellows, and would likewise have brought them in under 
different or even adverse conditions? And the splendid returns 
for the entire lot, 15 out of 61, elicit the same questions; just 
why should so many succeed in this severe test, when so many 
failed even in simple flights? 
Exp. 48. June 1. During the night of June 1-2 the native 
males that flew in numbered 15; of these, 12 came at the usual 
hour, about dawn, and the other three came at 10:40, 11:50 and 
1:35 o’elock. In addition, 8 marked cecropias, which have been 
