It is far from certain that the phenomenon of motion can anywhere exist where there is not thought. Motion may be distributed into four classes;Chapter he simpler motions, which result from what are called the essential properties of matter, and the laws of impulse; the more complex ones, which cannot be accounted for by the assumption of these laws; such as gravitation, elasticity, electricity and magnetism, the motions of the vegetable, and of the animal systems. Each of these seems further than that which preceded it, from being accounted for by anything we understand of the nature of matter.
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