348 



THE GYPSY MOTH. 



of the other stations it came, and the direct distance from 

 that station. The negative results in so many of the experi- 

 ments were not due to lack of care or attention to details, 

 but in some cases to a change of wind immediately after the 

 liberation of the males, and in others to a dying out of the 

 wind before the males had reached the females. Many of 

 the male moths, as is common with them when handled, 

 would drop to the ground and remain in the grass for a long 

 time ; and it was found necessary to liberate a number of 

 them at each station, in order to increase the chance of meet- 

 ing with the scent from the female. The following experi- 

 ments were made in July, 1895 : — 



Uxperiment JSfo, 1, 

 Weather, fair and clear. Wind, north-west ; average 

 movement, 12 miles. Two traps, containing seven female 

 moths each, were set up at 9.15 a.m., at station No. 1. At 

 station 2, one-fourth of a mile to leeward of the first station, 

 eight marked male moths were liberated at 9.25 a.m. At 

 station 3, one-half a mile to leeward of No. 1, seven marked 

 male moths were liberated at 9.35 a.m. Nothing resulted 

 from this experiment. 



JExperime7it iVb. 2. 

 Weather, fair. Wind, at 6.10 a.m., west; from 10 a.m. 

 to 3 P.M., east; average movement, 10 miles. Two traps, 

 containing six female moths each, were set up at 10 a.m., 

 ten feet from the ground. At station 2, one hundred and 

 fifty yards to leeward, nine marked male moths were liber- 

 ated at 10.15 a.m. At station 3, half a mile to the leeward 

 of station 1, nine marked male moths were liberated. Four 

 males were seen flying about station 1, but only one was 

 captured, and this one was from station No. 3, half a mile 

 distant. 



Experiment No, 3. 

 Cloudy. Wind, south-west to west ; average movement, 

 10 miles. Two traps, containing six female moths each, 

 were set up at station 1. Seven marked male moths were 

 let loose at 8.10 a.m. from station 2, two hundred yards to 

 leeward of the first station, and at 8.20 a.m. seven marked 



