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Письмо №67, стр. 15

of geology and see what science affirms there about the formation and growth of minerals. What is the origin of all the rocks, whether sedimentary or igneous. Take a piece of granite or sandstone and you find one composed of crystals, the other of grains of various stones (organic rocks or stones formed out of the remains of once living plants and animals, will not serve our present purpose: they are the relics of subsequent evolutions while we are concerned but with the primordial ones). Now sedimentary and igneous rocks are composed, the former of sand gravel and mud, the latter of lava. We have then but to trace the origin of the two. What do we find? We find that one was compounded of three elements or more accurately three several manifestations of the one element, — earth, water and fire, and that the other was similarly compounded (though under different physical conditions) out of