D. A pad of fat, lessening the friction of the bones, and modifying the shocks produced by jumping, &c.
"Again he said unto me, Prophesy upon these bones, and say unto them, O ye dry bones, hear the word of the Lord."—Ezekiel xxxvii.
935. Why are the bones of the arms and legs formed in long shafts?
Because a considerable leverage is gained, by which the advantages of quickness of motion, and increase of mechanical power, are secured.
936. Why are the bones of the hands and feet numerous and small?
Because the motions of the hands and feet are very varied and complicated. There are no less than twenty-eight bones in one hand and wrist; and about as many in a foot and ankle. To these are fastened a great number of ligaments and muscles, by which their varied compound movements are controlled. But for the complexity of the mechanism of our hands and feet, our motions would be extremely awkward, and many of the valuable mechanical inventions which now benefit mankind, could never have been introduced. The bones of the hands and feet are in number equal to one-half of the whole of the bones of the body.