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There these animals may Post Date: Fri, 15 Aug 2008 15:33:20 +0000 It would be difficult, if not impossible, for a bat to exist through the winter, unless it adopted the habit of hibernating ; for it cannot pursue in their hiding-places those insects which live through the winter, nor is it able to lay up a store of provisions for that season like the squirrel (why not?), nor are its powers of flight of so enduring a nature as to enable it like birds to migrate to warmer countries. Accordingly, when the raw weather sets in, the bat seeks out as protected a hiding-place as possible,, though one not too dry (why?), such as a mountain cave, a cellar, a loft, a ruined building, the hollow trunk of a tree, and so cm. There these animals may be met with often in crowds, hanging up by their feet, unconscious, stiff and motionless. Autor of the post: Undefined (95 F Post Date: Fri, 15 Aug 2008 15:22:00 +0000 In this condition the heat of the body drops from 35 C. to 14 C. (95 F. Autor of the post: Undefined But as soon as Nature Post Date: Fri, 15 Aug 2008 15:06:12 +0000 to 57 F.) ; the pulse only beats about once every three minutes, and the respirations are rare and hardly perceptible. But as soon as Nature reassumes her garment of green and the thousands of different kinds of insects reappear, the bat, too, reawakens to a new life. Autor of the post: Undefined In the case Post Date: Fri, 15 Aug 2008 14:53:22 +0000 Let us now inquire how it has been able to tide over the long period of cold and fasting. 1 If the body-heat of an animal, especially a warm-blooded one, sinks below a certain minimum, the creature must perish. In the case of the bat this issue is prevented by several means : (a) An Uncommonly Thick Hairy Covering. Autor of the post: Undefined 2 Although during its winter Post Date: Fri, 15 Aug 2008 14:42:37 +0000 The number of hairs covering the tiny body has been computed at about 1|- millions. These (b) The flying membrane, which enfolds the body like a mantle, likewise forms a protection against an excessive loss of body-heat, since the air enclosed within it acts as a bad conductor of heat. 2 Although during its winter sleep the bat is suspended like a corpse, life is by no means extinct in the interior of its body. Autor of the post: Undefined the least amount of work Post Date: Fri, 15 Aug 2008 14:25:53 +0000 The lungs, the heart and the other organs continue their work slowly but uninterruptedly. Now, even HAIR ~ F LONG . the least amount of work can in the animal body only be EARED BAT. Autor of the post: Undefined ^ Consequently the bat Post Date: Fri, 15 Aug 2008 14:10:52 +0000 performed by the combustion of food material (see p 6). * ag times). ^ Consequently the bat, from the superabundance of its food during the mild seasons, stores up, as in a larder, a supply of such material in its body, more especially in the form of fat. Autor of the post: Undefined (What would happen if Post Date: Fri, 15 Aug 2008 13:58:19 +0000 This fat by degrees enters the circulation, and is conducted thence to all the organs in which it undergoes combustion. In this manner the needful quantities of heat and force are continually produced afresh, so that, though the animal machine works slowly, it is not brought to a standstill. (What would happen if the animal, during its winter sleep, breathed as deeply and as often as during the period of its greatest vital activity ?) 3 The distribution of bats is rendered explicable from their mode of life. Autor of the post: Undefined During cold and long winters Post Date: Fri, 15 Aug 2008 13:44:08 +0000 The closer we approach the pole, the greater becomes the diminution in insect life. In cold countries the animals, even during the warmer months, would scarcely be able to find sufficient food, much less be in a position of laying up a store within their body for the winter. During cold and long winters they would in such countries inevitably perish from loss of heat or want of food would, in fact, either freeze or starve. Autor of the post: Undefined Ignorant people, again, charge them Post Date: Fri, 15 Aug 2008 13:27:09 +0000 Accordingly we do not meet with bats beyond the sixtieth degree of north latitude ; but their true home is in the warm South, with its abounding insect life. 1 In popular superstition bats, from their noiseless flight and their nocturnal mode of life, were once considered as evil spirits, and still at the present day it is the fashion to equip dragons and devils with bats' wings. Ignorant people, again, charge them with eating up the bacon in the larder ; but the structure of their teeth alone suffices to disprove this charge. 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