As if actuated by a sublime faith, in the midst of plenty they arise and depart, drawn ever to the remote solitudes to rear their young, like those citizens who return to their own country that their children may be born in the Fatherland. I do not know if our affinity is greater with the bob-white and the ruffed grouse, which hear no call to depart, or with these nomads of the earth. In the coldest weather, redpolls, crossbills and snow-buntings come to us as to a land of plenty. This is near enough the equator for these hardy birds--this is their genial South. It is pleasant to reflect that the falling mercury, which deprives us of the last of the summer residents, will at the same time bring us some dweller in the far North which perhaps otherwise we should not see. The advancing season makes itself known through the songsters; they have keener perceptions and receive other intimations than come to us. Day by day, as by appointment, they reappear from Florida, from the Amazon and the Orinoco, and make themselves at home again in northern pastures. I have come to look for the tree-swallows as regularly on the 1st of April, as for the oriole on the 10th of May, as if these were calendar events of real importance. Between the middle of April and the 20th of May lie the incomparable days of the migrating warblers--days of discovery and adventure, when the torpor of indifference slips away, and, like a subtle fire in the blood, is felt that enthusiasm the years do not diminish. When, at night, the small birds pass overhead, their faint silvery "tseeps" come out of the silence with a weird suggestion of voices from the unseen world. Now, the days are full of pleasing suggestions because of little birds shyly flitting with plant-down and with rootlets and dried grasses. Some are unmistakably house-hunting, and the female turns herself about in the crotch of a limb, trying if it be of the right proportions. Interest in bird life centers about this season. This is their life; the rest is a preparation or a waiting. It is only natural there should be an air of secrecy about them now. They are doing their best to conceal and elude, as indeed they must, and this necessity, being uppermost in their minds, becomes evident in their manner.