The Nuptial Flight 97 
was not the entire result of the test of the younger ones, how- 
ever; on the following morning 10 more arrived. This only 
shows that those which had had only one previous experience 
in coming to the roof were unable to repeat the performance in 
unfavorable winds, but probably had to wait until the winds 
shifted to a favorable direction or until, in their wanderings, 
they came into the path of the breezes. 
Exp. 16. May 21. Wind, northeast; station, 4% mile south. 
The 36 males used in this test were all young wild ones which 
had come in at the dawn of that day. At dawn, or to be exact, 
between 3:30 and 4:05 a. m., on May 22, 4 of these came in, and 
on the two following mornings two and three came in, or a total 
of 9 out of 36 in the three days. 
Exp. 17. May 21. Wind, northeast; station, 1 mile south. 
The setting for this test was the same as for the last, excepting 
that the distance was greater; here, too, the moths were not 
liberated in the direct path of the wind, but to one side of it. 
Of the 36 set free at 7:30 p. m., 2 came back the following dawn 
and one on the third morning. 
Exp. 18. May 21. Wind, northeast; station, 1% mile south. 
The time, place and wind were again the same as for Exp. 16, 
but the material was all bred males, six of which were two days 
old, one was one day old, and the other was a bred male which 
had successfully returned in Exp. 11, and was now seven days 
old. The last one came back the next morning, but the others 
were all permanently lost. 
Exp. 19. May 21. Wind, northeast; station, 14 mile south. 
Eleven experienced moths were liberated in the evening under 
Precisely the same conditions as in the three preceding tests. 
These, which had already made two flights to the roof, were 
Biven special colored markings, to distinguish them from the 
fommon stock. A few hours later, at dawn, five of these se 
Peared at the laboratory. Really, now, it is difficult to restrain 
oneself from jumping to conclusions, or at least from entertain- 
mg conjectures, when we briefly summarize the data from these 
t four experiments. All were exactly parallel as to pine, 
Place and weather. The wind was only partially favorable; = 
Was blowing toward the south-west, whereas to be favorable it 
uld have been directly toward the south, but this condition 
