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Normally, the check and drive systems are properly balanced. But under stress and strain the balance is upset. Indeed, the Kinetic Drive may be defined as a mechanism contrived in the course of evolution as the normal, healthy mode for meeting stress and strain.

It is possible and that, I think, is M. Lippmann's idea to draw from his very ingenious criticism an objection to the kinetic theory, if we admit the absolute value of the principle; but we may also suppose that here again we are in presence of a system where the prescribed conditions diminish the complexity and render it, consequently, less probable that the evolution is always effected in the same direction.

The kinetic system does not directly circulate the blood, nor does it exchange oxygen and carbon dioxid; nor does it perform the functions of digestion, urinary elimination, and procreation; but though the kinetic system does not directly perform these functions, it does play indirectly an important role in each, just as the kinetic system itself is aided indirectly by the other systems.

If, however, instead of an intense overwhelming activation, the kinetic system is continuously or intermittently overstimulated through a considerable period of time, as long as each of the links in the kinetic chain takes the strain equally the result will be excessive energy conversion, excessive work done; but usually, under stress, some one link in the chain is unable to take the strain and then the evenly balanced work of the several organs of the kinetic system is disturbed.

"Good Why, they would have to have the same kinetic energy as individuals as they now have as a whole, and that would be an average molecular velocity in random motion of 12.5 miles a second giving about about about twelve thousand degrees centigrade!" exclaimed Morey in surprise. "That would put it in the far blue-white region!" "Perfect. Now watch."

*Kinds of Bodily Energy.*—The healthy body has at any time a considerable amount of potential, or reserve, energy,—energy which it is not using at the time, but which it is able to use as its needs require. When put to use, this energy is converted into such forms of kinetic energy as are indicated by the different kinds of bodily power. These are as follows: 1.

Despite the theoretical difficulty thus presented, it seems probable that life is, in a certain sense, a physical energy, or at least its manifestation is. It is possible that the two states are similar to the difference between potential and kinetic energy; and we must remember that energy is always noticed or experienced by us, as energy, in its expenditure, never in its accumulation.

To a large extent he followed the older Utopists in assuming that the philosophical and constructive problem could be done once for all, and he worked the results out simply under an organised kinetic government.

As a step toward kinetic theory of matter, it is certainly most interesting to remark that in the quasi-elasticity, elasticity looking like that of an India-rubber band, which we see in a vibrating smoke-ring launched from an elliptic aperture, or in two smoke-rings which were circular, but which have become deformed from circularity by mutual collision, we have in reality a virtual elasticity in matter devoid of elasticity, and even devoid of rigidity, the virtual elasticity being due to motion, and generated by the generation of motion.

The stick in itself is inoffensive, as Professor Ostwald remarks, and it is its vis viva, its kinetic energy, which is painful to us; while if we possessed a speed equal to its own, moving in the same direction, it would no longer exist so far as our sense of touch is concerned.