The class-book of anatomy : designed for schools, explanatory of the first principles of human mechanism, as the basis of physical education . r of generating physical strength ; whilein the other, an extraneous force must be applied, some-where, to put it in motion. Surely the most sceptical must acknowledge in this in-stance, and it is only one of many millions which mightbe cued, that the work of an Almighty Being is here mostcertainly manifested. How simple the contrivance yethow astonishing the results ! In warm-blooded animals, the heart is a compound en-gine. If we go back to the fishes
The class-book of anatomy : designed for schools, explanatory of the first principles of human mechanism, as the basis of physical education . r of generating physical strength ; whilein the other, an extraneous force must be applied, some-where, to put it in motion. Surely the most sceptical must acknowledge in this in-stance, and it is only one of many millions which mightbe cued, that the work of an Almighty Being is here mostcertainly manifested. How simple the contrivance yethow astonishing the results ! In warm-blooded animals, the heart is a compound en-gine. If we go back to the fishes it is there sino-]e • butin man, quadrupeds and birds, it is double : they have twohearts, and both of them are forcing pump?. Man has ANATOMICAL CLASS BOOK. 121 two hearts, but they occupy less room by being joined to-gether, though, for aught we can discover, the systemcould be just as well supported, had one of them beenplaced at one side of the chest, and the other at anotherpart. By being united less substance is required ; sym-metry is preserved, and the union of the two actually con-duces to the greater muscular power of Explanation of Fig. 54. Rv this engraving, the reader will readily understand what wemean by the two hearts of man, and other warm-blooded animals, asthev are here exhibited, and as they appear when dissected «rh one of them is a perfect organ, by itself, and the one is per-fee ly independent of the other. W having the letter upon its the rieht heart,- and that with a g, the left. This is a frontSew or Uke look ng into the chest of another person. The rightheart is the engine of the lungs,- for ,t supplies those organs ex-clus vely Tlie left heart throws the blood as a ready remarked inJhe text! round the curve above g, in the direction indicated by thearrows over the entire body. , «are the cavas, or great veins,-returning blood from thehead and arms, and lower extremities. The uppermost is the su-periorvma cava, and the one below, th
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Keywords: ., bookcentury1800, bookdecade1830, booksubjectanatomy, bookyear1834
