Note 33 — EAST COAST OF ENGLAND.

Migration is a voluntary, and not a compulsory, movement; and it must not be imagined that recurring bird waves actually push each other forward. Young Blackbirds and Thrushes leave some weeks in advance of the great rush of their continental allies; and it is well known that Woodcocks, which breed in Great Britain, leave in the autumn, before the arrival of the northern flights, a distinct interval elapsing between the two events—the going and the coming.