Mr. Sowerby has further described the singular mode adopted by the long-eared Bat in capturing his prey. The flying apparatus is extended from the hind legs to the tail, forming a large bag or net, not unlike two segments of an umbrella, the legs and tail being the ribs. The Bat, having caught the fly, instead of eating it at once, generally covers it with his body, and, by the aid of his arms, &c., forces it into his bag. He then puts his head down under his body, withdraws the fly from his bag, and leisurely devours it. Mr. Sowerby once saw an unwary bluebottle walk beneath the body of the apparently sleeping Bat into the sensitive bag, in which it was immediately imprisoned. White, of Selborne, speaking of a tame Bat, alludes to the above described action, which he compares to that of a beast of prey, but says nothing respecting the bag. Bell, in his "British Quadrupeds," says that the interfemoral membrane of Bats "is probably intended to act as a sort of rudder, in rapidly changing the course of the animal in the pursuit of its insect food. In a large group of foreign Bats, which feed on fruit or other vegetable substances, as well as in some of carnivorous habits, but whose prey is of a less active character, this part is either wholly wanting or much circumscribed in extent and power." May it not be, asks Mr. Sowerby, that they do not require an entomological bag-net? The wing of the Bat is commonly spoken of as of leather; that it is an insensible piece of stuff--the leather of a glove or of a lady's shoe; but nothing can be further from the truth. If one were to select an organ of the most exquisite delicacy and sensibility, it would be the Bat's wing. It is anything but leather, and is, perhaps, the most acute organ of touch that can be found.