rom which such pests as the gypsy moth and the San Jose scale
have come to find some of their enemies and bring them to this country
to feed on these insects.

When men came upon the earth, they soon began to upset Nature's
arrangements, and from that time until now matters of this kind have
been growing worse. We have killed large numbers of the beneficial
animals and birds that kept the harmful ones in check. We have carried
others from the homes given them by Nature, where they were doing little
harm, to new homes where they have become terrible plagues.

The killing of large numbers of hawks and owls, all the species of which
many people have wrongfully thought to be harmful, has been followed by
a great increase in the numbers of rats and mice. We have killed off
most of the coyotes, the chief food of which was rabbits and ground
squirrels. The two latter animals have now become a serious pest. They
do enormous damage to the crops, and we spend thousands of dollars
fighting them.

The common rabbit has in most parts of its native country so many
enemies which are always on the lookout for a good meal, that it cannot
increase enough to do much harm. Years ago a number of rabbits were
taken to Australia, where there were none. Here they found a favorable
climate and few enemies. They have now increased so that they overrun
much of the continent and are a terrible pest which the farmers are
unable to control.

Some years ago the gypsy moth and the browntail moth were introduced by
accident into the New England states. Finding there a congenial climate
and few enemies, they increased rapidly. They soon began to strip the
leaves from the beautiful elms which make the streets and parks of this
region so attractive. Now these moths have turned their attention to the
white pine and are doing an ever-increasing amount of damage; and
although they are being fought by every means in our power, we are not
certain that we can ever control them.

The codling moth, whose larva is the little apple worm, causes an
immense loss in our fruit orchards. The cotton-boll weevil, which
destroys so much of the cotton, is, like the codling moth, an insect
imported from another country. The San Jose scale reached California
from China and has now spread throughout our country. It has a special
fondness for the sap of fruit trees, and, being so small, was not
noticed until it had got beyond control. This scale causes more loss
than any