The source of all plant energy being the radiant and 

 electric energy of the sun, the plants taken as fuel into 

 animals and there oxidized or burned reradiate solar energy. 

 The solar energy held within the plant, when taken into 

 the animal as food, is oxidized or burned in infinitesimal 

 quanta within the billions of cells of animals. Thus plants 

 capture and build up solar energy; furnaces and animals 

 reradiate solar energy; the reradiation of energy comes from 

 the burning of coal, wood, oil, or gas and from oxidation 

 within the cells of a fish, an eagle, a lion, or a man. 



This universal principle applies equally to the burning of 

 fuel in the cells of the animal body. Oxidation in the brain 

 cells releases radiant and electric energy, which enables the 

 brain to think. Oxidation in the countless billions of the 

 voluntary and involuntary muscle fibers provides body 

 warmth and muscular action. 



The Energy Control of the Living 



Plants have the equivalent of a bony skeleton in their 

 cellulose. Plants have the equivalent of tendons and fasciae. 

 They have a skin, they have lungs (leaves) and circulation 

 of sap, and the protoplasm of plants is analogous to the 

 protoplasm of animals. 



In one fundamental respect animals differ from plants: 

 animals can adaptively alter the speed of oxidation in their 

 various organs and tissues and increase the speed of this 

 energy output in one of a number of organs and tissues or 

 in combinations of these organs and tissues. That is, 

 animals can run or walk or swim; and plants cannot. 



In animals the special senses are highly developed. Only 

 the Venus's-flytrap and a few other plants have special 

 senses. The special senses in animals facilitate the release of 

 energy to promote their welfare. Animals and plants alike 

 have a basic metabolism. The basic metabolism of plants 

 and animals is required to maintain their structure. As ani- 

 mals evolved and searched for food and protection against 



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