ELEMENTS OF CHEMISTRY. The science of chemistry has its origin in the principle, that the bodies which constitute the external world are composed of a variety of elements, united according to certain laws. If we could eonceive a universe consisting only of iron, or quicksilver, or sulphur, the objects of the astronomer might still remain as extensive and as sublime as they are in the actual state of things ; for, in tracing the constitution of planetary and satellitic systems, or reducing to precise laws the forces by which the motions of the heavenly bodies might be produced, all the resources of his science would still be brought into play. In like manner, the physical sci ences could attain perfection, for the relations of these bodies to heat, to light, to electricity, the various problems and laws of statical and dynamical forces, could have been known, and thus all that is essential to the science of natural philosophy might be attained. But not even an idea of chemistry could...

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