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FORE:In like manner, Lucretius rejects the theory that living bodies are made up of the four elements, much as he admires110 its author, Empedocles. It seemed to him a blind confusion of the inorganic with the organic, the complex harmonies of life needing a much more subtle explanation than was afforded by such a crude intermixture of warring principles. If the theory of Anaxagoras fares no better in his hands, it is for the converse reason. He looks on it as an attempt to carry back purely vital phenomena into the inorganic world, to read into the ultimate molecules of matter what no analysis can make them yield��that is, something with properties like those of the tissues out of which animal bodies are composed.Wind-power, aside from the objections of uncertainty and irregularity, is the cheapest kind of motive-power. Steam machinery, besides costing a large sum as an investment, is continually deteriorating in value, consumes fuel, and requires continual skilled attention. Water-power also requires a large investment, greater in many cases than steam-power, and in many places the plant is in danger of destruction by freshets. Wind-power is less expensive in every way, but is unreliable for constancy except in certain localities, and these, as it happens, are for the most part distant from other elements of manufacturing industry. The operation of wind-wheels is so simple and so generally understood that no reference to mechanism need be made here. The force of the wind, moving in right lines, is easily applied to producing rotary motion, the difference from water-power being mainly in the comparative weakness of wind currents and the greater area required in the vanes upon which the wind acts. Turbine wind-wheels have been constructed on very much the same plan as turbine water-wheels. In speaking of wind-power, the propositions about heat must not be forgotten. It has been explained how heat is almost directly utilised by the steam-engine, and how the effect of heat is utilised by water-wheels in [42] a less direct manner, and the same connection will be found between heat and wind-wheels or wind-power. Currents of air are due to changes of temperature, and the connection between the heat that produces such air currents and their application as power is no more intricate than in the case of water-power.

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