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going from the trunk of the body to the limbs of 

 quadrupeds, are inserted so low down the limb, 

 as almost to conceal the parts which correspond 

 respectively to that part of the arm of man which 

 is above the elbow, and to the thigh ; and this low 

 insertion of the muscles, giving them thus the 

 advantage of so much longer a lever, readily ac- 

 counts for the much greater power with which 

 they act. Their manner of performing on a flat 

 surface the walk, the amble, the trot and the 

 gallop, needs not to be particularly described. 

 In climbing, some few, like the walruss, seem to 

 attach themselves, like lizards, by forming a va- 

 cuum with the soles of their feet ; but the majo- 

 rity use their claws for this purpose, arid these 

 in some tribes, for example sloths and ant-eaters, 

 are so long, that they are almost incapable of 

 walking on a horizontal plane. In conclusion, 

 I may observe that, so nicely and admirably are 

 ah 1 the organs of loco-motion in quadrupeds 

 adapted to each other, that an anatomist, from 

 the inspection of any one bone out of the two or 

 three hundred which compose the skeleton, is 

 enabled to infer the general form and relations 

 of all the rest, as well as of the ligaments which 

 connect, and the muscles which move them. 

 Nor is this all : for, so intimately does the struc- 

 ture of this shell, as it were, of the body corres- 

 pond with that of the internal parts, that, from 

 this one bone he may almost give a description 

 of every organ of the animal of its propensities, 

 , and of its habits ! Can this correspondence be 



