134 Trans. Acad. Sci. of St. Louis 
It will be seen in Table 3 that in the 32 experiments, 683 
male cynthias, which had emerged from their cocoons in the 
laboratory, were taken out in various directions and liberated 
at various distances, ranging from 50 feet to 214 miles. Out 
of this number, 214, or 31 per cent, made their way back to the 
females on the roof. Of these, 180 came in the first night. 
Let us first summarize our data on the return of the moths in 
favorable or unfavorable winds—that is, winds which blow from 
the caged females toward the males, and those which do not. 
Exp. 16 is omitted from this summary for the reason given 
elsewhere and only those moths which came in the first night are 
considered, because the later ones were subject to varying winds 
which could not be traced. 
Favorable Wind. 
Liberated Distance Returned Per Cent 
50 feet 58 45 
31 1/8 mile 14 45 
63 1/5 mile 27 43 
80 1/2 mile 44 55 
85 3/4 mile 1 3 
37 1 mile 6 16 
26 11% mile 1 4 
20 214, mile 2 10 
420 153 36 
Unfavorable Wind. 
Liberated Distance Returned Per Cent 
34 50 feet 12 35 
8 1% mile 2 25 
138 14 mile 6 4 
21 1 mile 0 0 
20 14% mile 0 0 
20 2 miles 1 5 
241 21 9 
Here we see that out of 420 moths liberated in favorable 
winds, 153, or a little over 36 per cent, returned, in contrast to” 
less than 9 per cent of those in unfavorable winds. However, 
