18 THE DISPERSION" OF THE GIPSY MOTH. 
moderately to badly infested with the gipsy moth, and it was ex- 
pected that if the young caterpillars were carried by air currents it 
would be possible to secure some of them in the tanglefoot which 
was applied to the wire netting. The pond is about a mile and a half 
long- and three-fourths of a mile wide. As there are two small 
islands on which brush and sprouts were growing near the west side, 
an attempt was made to anchor the raft as nearly as possible at a 
point midway between the islands and the opposite shore. The raft 
was constructed April 25, 1910. and an attempt was then made to 
anchor it in the center of the pond. Owing to the high wind it was 
found impossible to do so, therefore it was anchored near one of the 
small islands, where it remained until May 2, when the anchorage was 
changed to the center of the pond. On this date the screens were 
examined, but no larvae were found in the tanglefoot. 
On May 9 the pond was visited, and it was found that the raft 
had drifted from its anchorage to the shore at the northeastern end 
of the pond. Infested woodland was present within 200 yards of 
where the raft lodged. The tanglefoot was examined, but no cater- 
pillars were found. Owing to the strong wind it was impossible to 
tow the raft to the center of the pond, so it was allowed to remain 
where it was found. 
On June 9 a visit was made to this trap for the purpose of making 
the final examination and dismantling it. A single caterpillar was 
found in the tanglefoot, which proved upon a careful examination 
to be a first-stage gipsy-moth larva. Owing to the difficulty of thor- 
oughly examining the wire screen, because some of the tangle- 
foot had become rather hard and also because of the presence of 
an innumerable number of Micro-Diptera and other small insects, 
the screen was taken from the wooden form and brought to the 
laboratory, where later in the season it was cut up into small strips 
and thoroughly examined. This Avork was done by Mr. J. V. Schatf- 
ner and Mr. Emery Proctor, but no other gipsy-moth caterpillars 
were found upon it. During the first part of the experiment the 
weather was cool, which probably resulted in the young larva 3 mov- 
ing about but little, and this may explain why more caterpillars 
were not caught in the trap. Attention should be called to the small 
area of screen which was exposed, and in the light of future experi- 
ments it does not appear strange that no more caterpillars were 
secured. 
EXPERIMENTS IN LYNN WOODS, MASS. 
It did not seem practical, hoAvever. when the experiment Avas 
planned, to attempt to settle the question by making one test. Several 
other screens Avere constructed, and one made in a similar manner 
to the one used on the raft at Lincoln Avas placed on top of an obser- 
