III
You must see how close you had passed to and fro all summer to the vireo’s nest, hanging from the fork on a branch of some low bush or tree, so near to the path that it almost brushed your hat. Yet you never saw it! Go on and make a study of the empty nests; see particularly how many of them were built out along the roads or paths, as if the builders wished to be near their human neighbors—as, indeed, I believe they do. Study how the different birds build—materials, shapes, finish, supports; for winter is the better season in which to make such study, the summer being so crowded with interests of its own.