112 Trans. Acad. Sci. of St. Louis 
over certain fields which for a few days had not been in the 
path of our breezes? 
Exp. 61. June 13. While I was on the roof all night wait- 
ing for cynthias which did not return, I had leisure to watch 
for the arrival of cecropias also. This was a bright starlit night; 
the breeze was not perceptible, but the smoke issuing from a 
tall chimney rose high in the air and disseminated toward the 
southeast. My vigil was in vain, for none came early. During 
the dawn hour, 19 came in, 16 of which were from the south- 
east; the direction of the others was not noticed. 
Exp. 62. June 15. Wind, imperceptible; station, 100 feet 
west. Fifteen wild moths which had come in at dawn on June 
13, and 3 of the blind ones which had returned in Exp. 58, 
were used in this test: The eyes of all were covered with the 
black enamel. They were liberated 100 feet west, with no wind, 
at 11:30. At dawn, 3 of these came in; those which were out 
for their second sightless flight were not among them. 
Exp. 63. June 15. Wind, none; station, 100 feet west. 
Fifteen moths with mutilated antennae figured in this test. 
Five of these had half of each antenna off; five were without 
the entire left antenna and five without the right; two 
normal moths were added as controls. During the fol- 
lowing dawn, 4 of the mutilated cecropias (two with half 
of each antenna, one with right and one with left antenna) re- 
turned, but only one of the normal moths came back, and he 
came only as a wanderer a day later. I wanted to repeat this 
test with a large number of moths, to see if, as appears here, 
those with half of each antenna are more capable of following 
a trail than those with all of only one antenna, but the quantity 
of material was too depleted to afford them in large numbers. 
Exp. 64. June 16. While I was kept busy all night catch- 
ing cynthia males which came to the roof, no cecropias came 
before 3:40, and they ceased at 4:25. During that 45 minutes, 
15 wild and 7 marked cecropias came in. It was suprising that 
among the 15 wild ones, all but 2 appeared young, perhaps 
a day old; this indicates that the Missouri wild moths were 
emerging later than my New York stock. 
Exp. 65. June 17. I waited all night and took the 
eynthias which came in. The work so far indicates that these 
