34 
were simply met with in their regular flight through the field for the 
evening, and that their course had not been materially influenced by 
the lights. Despite this fact, it was evident that the probabilities of 
trapping the moths at this height were increased. To vary the experi- 
ment, the lamp was carried through the field at about the height just 
mentioned, and one person walked along on each side some distance 
from the lamps so as to disturb the moths in that vicinity. In this way 
still more of the moths came near the lamps, and another one was 
caught. This is impractical, however, since the expense of labor is 
too great, at least until some means of making the lights more efficient 
is effected. 
One of the lamps was provided with a shield constructed so that it 
would revolve with the wind, and thus prevent the lights from being 
blown out. This is entirely wrong, since the moth usually flies with 
the wind, in which case the light is of course shut oft from view en- 
tirely. This defect renders the lamp entirely worthless for the end de- 
sired. In our experiments this shield was held or made stationary, and 
hence the defect did not enter or vary the significance of the results. 
At Holly Springs, Mississippi, lamps were placed in cotton fields at 
various times during August. Some consisted merely of beer bottles 
filled with kerosene and a piece of unraveled cotton rope for a wick, and 
others of more powerful lamps. In all cases the lamps were placed in 
pans containing an inch or so of water, with a little oil on the surface, 
the whole being placed on a supporting pole or pedestal. The beer- 
bottle lamps burned satisfactorily, produced a good light, and attracted 
insects of nearly every order and kind except the Boll Worm moth, 
though these had been seen flying about in the field late in the after- 
noon. 
On the night of September 9 these lamps were again taken into a 
cotton field having a small patch of corn near by ; also a large patch 
of weeds, principally sneeze weed {Helenium tenuifolium). A lamp was 
placed in each at about the level of the tops of the plants, except the 
one in corn which was placed on about the same level as the ears on 
the plants. By 5 o'clock the moths were seen flying plentifully and 
ovipositing freely. The lamps were lighted at 6:15 o'clock. No insects 
of any kind were attracted until 7 o'clock, when moths of all kinds be- 
gan flying near the lamps. By 7:15 a Boll Worm moth had been 
caught at the lamp in corn. At 7:25 at the lamp in cotton a Boll 
Worm moth flew near the lamp, alighted on the pedestal and rested. 
From here it flew up to a small boll in the direct light of the lamp, de- 
posited an egg and flew oft'. From this time on many Ichneumonids and 
other Hymenoptera, as also great numbers of Microlepidoptera were 
caught. At 7:40 a Boll Worm moth was seen to fly through the flame of 
the lamp but was not captured. In corn at 7:50 a moth flew about the 
lamp and alighted on a blade of corn less than 2 feet away. For this 
act of defiance it was introduced to the cyanide bottle. Not many 
