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which the workers have given the name colonies or groups of colonies. 
It is therefore unnecessary to work through hundreds of acres of wood- 
land, but only here and there through patches of comparatively few acres. 
This distribution is readily accounted for by the fact that the insect 
spread from a common center in Medford, not by the flight of the moth, 
for the moth does not fly, but by caterpillars being carried upon the 
clothes of pedestrians, and upon buggies, market wagons, carts, and 
other vehicles, and crawling off again at some stopping place perhaps 
miles from the original center. This had been going on for years before 
the State work was begun. 
Wherever circumstances favored the production of a female moth at 
one of these stopping places of the caterpillars and a male moth was at 
a near enough distance to allow it to fly to the female and fertilize her, 
there a colony was apt to be started the next year by the larvae hatch- 
ing from the consequent batch of eggs. Of course, many such addi- 
tional colonies proved abortive and died out, but many others continued 
to propagate and to gradually spread, although very slowly. At the 
same time, however, when they had become of a certain size, they were 
again centers of distribution in the same way. Owing to the slowness 
of natural spread of the insect, very few of the colonies, so called, are 
of any great extent, so that by stamping out one here and one .there 
and a third in some other place, a considerable extent of woodlands 
can be rid of the insect. Moreover, on account of the vastly less fre- 
quent traffic through woodland regions, the colonies are by no means 
as widespread and are in almost every case to be found in the immedi- 
ate vicinity of the traversing roads. 
In the case of these woodland colonies the committee at once realized 
that the work was very difficult and would have to be of the most 
thorough character, and in the carrying out of work of this thorough 
character, much opposition from the owners of the lands was antici- 
pated. Such opposition has been found in some cases, while in others 
the committee has been agreeably surprised to find that the gravity of 
the case has brought about a disposition to permit almost any kind of 
extermmative work. 
It is interesting to note that a large portion of the woodland which 
the committee has been obliged to treat was not owned by individuals, 
but belonged to the parking systems of the different towns. In a way 
this has facilitated the work of the committee, since they have been 
enabled to treat in such cases with one body for a large area; but in 
another way it has proved something of a hindrance, since the parking 
people have, in general, been less complaisant than individual owners. 
Owing to the great desirability, and in fact the almost absolute 
necessity, of avoiding popular opposition, the committee has been loath 
to use the powers conferred upon it by law in the way of forcibly enter- 
ing premises and carrying on the necessary work. It has much pre- 
ferred to adopt the conciliatory measures of enlisting the owner's 
