EXPERIMENTS AT CLIFTONDALE, MASS. 19 
vation tower at Mount Gilead in the Lynn Woods. (PI. VII.) 
The arms on these screens were 10 feet long and 4 feet high. The 
trap was placed at the top of a tower 50 feet from the ground and 
fully 25 feet above the tops of the tallest trees. A few caterpillars 
were feeding on April 29, the date when the trap was installed. 
The object of this experiment was to determine, if possible, 
whether caterpillars could be caught high in the air. The woodland 
surrounding this tower was badly infested, and later in the season 
a considerable area was completely stripped of foliage. On May 4 
Oie trap was examined, but no caterpillars could be found. A large 
percentage of the gipsy-moth caterpillars had hatched, but most of 
the larva? were still on the egg clusters, although some were feeding. 
The weather was cool, and only a slight wind was blowing. 
The trap was examined on May 7, 11, 16, and 17, but no caterpil- 
lars could be found. On May 28 another examination was made 
with the same result. In woodland the caterpillars were now in the 
second, third, and a few in the fourth stage. The weather Avas cool, 
and very few were spinning down from the trees. On June 7 another 
examination was made, and on the 13th the screen was moved and 
brought to the laboratory, where it was examined later in the season 
by Messrs. Proctor and Schaffner, but no gipsy-moth caterpillars 
were found. 
EXPERIMENTS AT CLIFTONDALE, MASS. 
Another experiment was conducted near Cliftondale, Mass. Per- 
mission was secured to drop wire screens, which had been tangle- 
footed, from the sides of a high water tower (PL VIII) at the old 
Saugus race track, which borders a large area of salt marshes. These 
screens were manipulated with ropes and pulleys in such a way 
that they could be raised and lowered in order to make examinations. 
On one side of the tower, to the eastward, no trees were growing 
for a distance of about 2 miles, and the nearest trees in any direc- 
tion, except for a few willow sprouts growing along the edge of the 
race track which will be mentioned later, were a quarter of a mile 
distant. 
Two screens, 34 feet long and 6 feet wide, were dropped from the 
east side of the tower, while another screen of the same dimensions 
was suspended on the west side. They were placed in position April 
30, 1910, and were examined at intervals until the middle of June. 
On May 11, a single gipsy-moth caterpillar was found on one of the 
screens on the east side of the tower, 25 feet from the ground. On 
May 18 a stock of newly hatched gipsy-moth caterpillars was lib- 
erated in the marsh 1,500 feet south of the tower at several stations, 
the idea being to give an opportunity for the larva? to be carried 
by the wind to the tanglefoot screens. No caterpillars were found 
