Page:Thoughts on art and life.djvu/185

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water and earth, and this force is infinite, because infinite worlds could be moved by it if instruments could be made by which the force could Force be generated. Force, with physical motion, and gravity, with resistance, are the four accidental powers by which all mortal things live and die. Force has its origin in spiritual motion, and this motion, flowing through the limbs of sentient animals, enlarges their muscles, and thus enlarged the muscles are shrunk in length and contract the tendons with which they are connected, and this is the cause of the strength in human limbs. The quality and quantity of the strength of a man can generate a further force, which will increase in proportion to the duration of the motions produced by them.

20.

Gravity, force and casual motion together withresistance are the four external powers by whichall the visible actions of man live and die.

21.

A motion tends to be continuous; a body set in Of motion continues to move as long as the impres sion of the motive power lasts in it.

22. The bird is an instrument which operates by mathematical laws, and man can reproduce all

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