58 THE DISPERSION OF THE GIPSY MOTH. 
The result in Wareham indicates that there may have been some 
dispersion by the wind, but only a few of the colonies can be ac- 
counted for in that way. 
RESULTS OF SCOUTING WOODLAND AREA. 
On the whole, the number of woodland infestations found is not 
so large as might be expected. Those at Milton. X. H., and Yar- 
mouth, Me., are the most striking, probably furnishing the most 
definite results of any of the towns under consideration. Owing 
to the long distance from Lisbon, Me., to the nearest badly infested 
area, which is about TO miles, and to the large quantity of unfavor- 
able food for the caterpillars, it is not surprising that little evidence 
was secured to show that the infestations were caused by the wind. 
The other infestations in the town, however, indicate that there may 
have been a short-distance spread in this way. In Yarmouth, Me., 
the proportion of coniferous growth was practically the same as 
that in Milton, N. H., but the wooded area examined was only 
about one-fourth of that scouted in the latter town. Oak trees, 
however, predominate in the woodland in Yarmouth; hence it is 
not surprising that a larger number of colonies were found in that 
town than in Lisbon. More woodland colonies were found in Milton 
than in any other town, and this is what would naturally be expected, 
as it is near badby infested towns and is located so that the prevail- 
ing wind would convey large numbers of the small caterpillars. The 
woodland examined contained only about 13 per cent of oak. If this 
species had been as abundant in Milton as it was in Yarmouth far 
more serious infestations would probably have resulted. 
Scouting in Tilton indicates that good work was done in suppress- 
ing the gipsy moth during 1910 and 1911. The town is located a 
little out of the line of wind dispersion, and this, coupled with care- 
ful hand work, has evidently resulted in the satisfactory condition 
which has been reported. 
The results in Bennington, N. H., a town which is located on high 
land, where 21 per cent of the trees are oak, point strongly to the 
fact that the woodlands do not become infested rapidly when they 
are located in a region unfavorable for larval spread by the wind. 
Although about 5 square miles were examined in this town, no 
woodland infestation was found; and when it is remembered that 
this area is less than 10 miles from towns which were found infested 
in 1908 and 1909, the evidence is further strengthened. The danger 
of artificial spread of gipsy-moth caterpillars on vehicles is probably 
less in this town than in any of the towns where woodland areas 
have been scouted. 
The scouting in Gardner and Wareham, Mass., was handicapped 
by the fact that the woodland growth was not satisfactory for the 
