. The anatomy and physiology of the human body. Containing the anatomy of the bones, muscles, and joints; and the heart and arteries. he mouth, the anus, and especially all the respiratory tubes, lose an internal skin, at the same time that the old skin or slough is pushed off from the outward surface of the body; and when the puncta are thus changed, they are left more open than before, and often their number is changed. For the drawing of thi,s slough or skin (a)—from which the Worm has just disengaged itself, and the old air tubes (^)—inverted, and adhering to the cast skin, see figure 8. w
. The anatomy and physiology of the human body. Containing the anatomy of the bones, muscles, and joints; and the heart and arteries. he mouth, the anus, and especially all the respiratory tubes, lose an internal skin, at the same time that the old skin or slough is pushed off from the outward surface of the body; and when the puncta are thus changed, they are left more open than before, and often their number is changed. For the drawing of thi,s slough or skin (a)—from which the Worm has just disengaged itself, and the old air tubes (^)—inverted, and adhering to the cast skin, see figure 8. which is the figure of the Cossus, an affected name by which Mouffet and others have chosen to distinguish the Worm from which the Horned Beetle proceeds. These are the various ways by which insects are suppliedwith air ; and nothing can be more interesting than to observethe .vast proportion of air which they draw in, which is cer-tainly a provision for their living in places where oxygene can-not be plentifully supplied. And the fact is well known, that Minsects can live on air much less pure than what is necessary \ )-> Oi KtSPiKATXON. to breathing creatures, and that they exhaust the oxygene of |the atmosphere much more completely than any other livingcreature. The variety in the manner of conducting the air tothe system of insects is changed, and suited, as I have ob-served, to their various ways of life, and to the various con-ditions and stages of their life ; while they are Worms, whenthey are involved foetuses, and when they have burst their shelland are full grown. In short, Worms, Aurelise, Flies, Beetles,Bees, and all forms of insects, have all of them their tracheasby which they breathe a wonderfully large proportion of air. There can be no mistake concerning the function of theirair tubes and of their heart; it is ignorance or inattention onlythat can cause confusion; the heart of a Caterpillar, of aSnail, of the Worms from which various Flies are pro
Size: 1811px × 1380px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecad, booksubjecthumananatomy, bookyear1822
