The power of flight possessed by these birds is truly wonderful, and the distance to which they can travel through the air, without the possibility of rest, is almost incredible. Nevertheless, at one time, and that not many years ago, it was believed that on the approach of cold weather Swallows plunged to the bottom of some pond, in the mud of which they passed the winter, and revived again in spring. So long ago as the year 1849 this subject was brought before the Academy of Sciences at Stockholm, and the following document, which, coming from the quarter it did, was by some looked upon as an irrefragable proof of the truth of this strange story, was submitted to and gravely discussed by that learned body:--"Near to the estate of Kafvelas, in the province of West Gothland, there is a little lake called Djpasjon, where on several occasions in the winter time, when the ice-net has been drawn, _stelnade_, or stiffened Swallows, have been brought up in my presence. My father, then Inspector at Kafvelas, who was also present, directed me to take some of them home, and place them in a chair at some little distance from the fire. This I did, and, to my great astonishment, I soon observed the birds to draw their heads from under their wings, where they had been previously placed, and in a few moments to fly about the room. But as this was not the proper season for their quickening, they lived but a short time afterwards." So often has this statement been repeated, that even Wilson felt himself called upon to confute it. "The Swallow," says that graphic writer, "flies in his usual way, at the rate of one mile in a minute, and he is so engaged for ten hours every day; his active life is extended on an average for ten years, which gives us two million one hundred and ninety thousand miles--upwards of eighty-seven times the circumference of the globe. And yet this little winged seraph, if I may so speak, who in a few days can pass from the Arctic regions to the torrid zone, is forced when winter approaches to descend to the bottom of lakes, rivers, and mill-ponds, to bury itself in the mud with eels and snapping turtles, or to creep ingloriously into a cavern, a rat-hole, or a hollow tree, with snakes, toads, and other reptiles, till the return of spring! Is not this true, ye wise men of Europe and America, who have published so many _credible_ narratives upon this subject? The Geese, the Ducks, the Cat-bird, and even the Wren, which creeps about our houses like a mouse, are all declared to be migratory, and to pass to southern regions on the approach of winter. The Swallow alone, on whom Heaven has conferred superior powers of wing, must sink in torpidity to the bottom of some pond to pass the winter in the mud!" [Illustration: THE MARTIN (_Chelidon urbica_).] We must confine our notice of the True Swallows to the mention of two other species, one remarkable for its size, and the other for the very peculiar formation of its tail.