The Philosophical magazine; a journal of theoretical, experimental and applied physics . direction,—all the secondary forms of the crystal maybe easily deduced. In place of employing, as Hauy has done, integrant moleculeshaving the form of a tetrahedron, a triangular prism, and aparallelopiped, others have suggested the more philosophicalidea of constructing crystals out of spheroidal elements, including,of course, the sphere by which the oblate passes into the prolatesolid. But in whatever way crystallographers shall succeed inaccounting for the various secondary forms of crystals, they areth
The Philosophical magazine; a journal of theoretical, experimental and applied physics . direction,—all the secondary forms of the crystal maybe easily deduced. In place of employing, as Hauy has done, integrant moleculeshaving the form of a tetrahedron, a triangular prism, and aparallelopiped, others have suggested the more philosophicalidea of constructing crystals out of spheroidal elements, including,of course, the sphere by which the oblate passes into the prolatesolid. But in whatever way crystallographers shall succeed inaccounting for the various secondary forms of crystals, they arethen only on the threshold of their subject. The real constitu-tion of crystals would be still imknown; and though the exami-nation of these bodies has been pretty diligently pm-sued, we canat this moment form no adequate idea of the complex and beau-tiful organization of these apparently simple structures. Thedouble refraction and pyro-electricity of crystals related to cer- * From the Transactions of the Royal Society of Edinhurgh, vol. 1; having been read Februaiy C, 32
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