But the migration from the hedgerows was very marked. They became quite empty and silent about the middle of September. This state of things continued for little more than a week--meaning the absolute silence-- then a bird or two appeared in places at long intervals. They now came back rapidly, till, on the 28th, the `fink, chink' of the finches sounded almost as merrily as before. The greenfinches flew from tree to tree in parties of four, six, or more, calling to each other in their happy confidential way. On that day the trees and hedges seemed to become quite populous again with finches. The sparrows, too, were busy in the roads once more. For a week previously every now and then a single lark might be heard singing for a few minutes: they had been silent before. On the 28th half-a-dozen could be heard singing at once, and now and then a couple might be seen chasing each other as if full of gaiety. It was indeed almost like a second spring: at the same time a few buttercups bloomed, to add to the illusion. This migration of the finches from the hedgerows out into the fields, and their coming back, is very striking. It may possibly be connected with the phenomenon of `packing;' for they seem to go away by twos and threes, to disappear gradually, but to return almost all at once, and in parties or flocks. The number in the flocks varies a great deal: it is a common opinion that it depends on the weather, and that in hard winters, when the cold is severe and prolonged, the flocks are much larger. Wood-pigeons are seldom, it is said, seen in great flocks till the winter is advanced. Has the date of the harvest any influence upon the migration of birds? The harvest in some counties is, of course, much earlier than in others--a fact of which the itinerant labourer takes advantage, following the wave of ripening grass and corn. By the time they have mown the grass or reaped the wheat, as the case may be, in one county, the crops are ripe in another, to which they then wend their way.