A text-book on chemistryFor the use of schools and colleges . nts, underthe influence of sunlight, may be brought again into avisible condition. If, in a closed flask of air, counter-poised on the arm of a balance, a few grains of gun-powder be exploded, though the solid has disappearedfrom sight, the contents of the flask weigh as much asever; that arm of the balance does not move upward. To the doctrine of the indestructibility of matter hasbeen added that of the correlation and conservation offorce. By these terms it is implied that force is equal-ly indestructible with matter, but that, in
A text-book on chemistryFor the use of schools and colleges . nts, underthe influence of sunlight, may be brought again into avisible condition. If, in a closed flask of air, counter-poised on the arm of a balance, a few grains of gun-powder be exploded, though the solid has disappearedfrom sight, the contents of the flask weigh as much asever; that arm of the balance does not move upward. To the doctrine of the indestructibility of matter hasbeen added that of the correlation and conservation offorce. By these terms it is implied that force is equal-ly indestructible with matter, but that, in addition, itmay present a variety of transformations. It may bestored up, or disappear in a latent state, as in the caseof heat and light concealed in plants, and originally de-rived from the sun. Heat, light, electricity, motion, areall regarded as mutually convertible without loss. Theconversion of motion into heat may be illustrated byan experiment. If a piece of metal tube, closed at thebottom, be so arranged, Fig. 6, as to be set in rapid rev- Fig. olution, on filling it with cold water, and causing itsexterior to be compressed by a pair of hinged pieces of How may it be shown that matter is not destructible ? What ismeant by correlation and conservation of force? Explain the ex-periment illustrated in Fig. G. ? A 2 10 HISTORY OF CHEMISTRY. wood, T, the friction will produce in a few minutes heatenough to boil the water. If a cork be inserted intothe mouth of the tube, it will be violently expelled aftera short interval. Many experiments showing these conversions mightbe described. By a thermo-electric pile, heat maybe converted into a current of electricity, magnetismproduced in a coil, chemical affinity exhibited in the de-composition of solutions, and light given out in thespark. The doctrine of the conservation of force is by nomeans new, having been asserted by the i^rabians, whoincluded the force exhibited in the animal functions,even intellection, in the same c
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