And as I look abroad in autumn, and view the bevies of snowbirds that have just returned to us, and hear again the familiar "chip," "chip," as a passing vehicle puts them to sudden flight, how the finger of thought touches again on memory's bell, and I think of boyhood's happy hours, when I welcomed with delight the snowbirds back again to our lanes and fields. Each feathered songster, as it revisits us from northland or southland, awakens feeling of profoundest interest, and if we have within us a single spark of that divine love of nature that dwells with the poet or the naturalist, we instinctively receive the birds back to their old haunts as we would welcome a long-absent friend. What boy of sensibility, having a spark of the nobler touch of manhood, could have it in his heart to harm the least of these sinless creatures that enliven our homes with their presence and song? Who can look without admiration upon them? Who could wish to destroy them? And when we reflect that the martins, willets, swifts and swallows that sport about our homes in summer, and the mocking bird that trills its polyglot song in our cedar groves by night, have returned to us from tropical or sub-tropical climes--that only a few weeks before they were flitting through the orange groves of Cuba, or building their nests amid the vine-latticed thickets of Florida, we cannot but admire and wonder at that "peculiar instinct," as Howitt calls it, that guides them with such unerring certainty through all the changes of their mysterious round. For a period of twenty years the average time of the arrival of the purple martin has been about the last five days in March; and its departure for the South the second week in August. A few individuals may remain longer, but it is only when their breeding has been delayed. The earliest appearance of the martin that I have noted was the 8th of March, 1871, the latest the 26th of April, 1885. The last date was a cold and backward spring. This bird rears two broods of four or five each during the four months that it remains with us. The chimney swift comes a week or ten days later than the martin, and seldom begins to build before the 10th of June. It raises one brood of four to six young, usually in some unused chimney. It remains with us longer than the martin, even until the cool nights of the last of September remind it that "the summer is over and gone." The flight of this bird is employed as a weather sign by country people. When it soars high, they say fair weather will continue, but when it flies low, then rain is near at hand.