These varieties would cross and blend where they met; but to this subject of intercrossing we shall soon have to return.

I may add, that, according to Mr. Pierce, there are two varieties of the wolf inhabiting the Catskill Mountains in the United States, one with a light greyhound-like form, which pursues deer, and the other more bulky, with shorter legs, which more frequently attacks the shepherd's flocks.

It should be observed that in the above illustration, I speak of the slimmest individual wolves, and not of any single strongly marked variation having been preserved.

In former editions of this work I sometimes spoke as if this latter alternative had frequently occurred.