The Philosophical magazine; a journal of theoretical, experimental and applied physics . the Disintegrated Surfaces of Crystals. 17 tain fixed points of their primitive forms ; and the phecnomcna ofcircular polarization in quartz and amethyst, connected with theplagiedral faces of the crj^stal, indicate remarkable peculiaritiesof structure; and I have had occasion to show that all the pro-perties comprehended under double refraction and polarizationdo not exist in the ultimate molecules of the body, but are whollythe result of those forces by which these molecules arc still
The Philosophical magazine; a journal of theoretical, experimental and applied physics . the Disintegrated Surfaces of Crystals. 17 tain fixed points of their primitive forms ; and the phecnomcna ofcircular polarization in quartz and amethyst, connected with theplagiedral faces of the crj^stal, indicate remarkable peculiaritiesof structure; and I have had occasion to show that all the pro-perties comprehended under double refraction and polarizationdo not exist in the ultimate molecules of the body, but are whollythe result of those forces by which these molecules arc still more complicated have been discovered by theanalysis of polarized light; and in the complex formations ofApojjhyllite and Analcime, we witness the operation of lawsresembling more those which regulate the structures of animallife than those which had pre\ iously been observed in crystallineformations. The doubly refracting structure of crystals, or to use the lan-guage of the undulatoiy theory, the law according to which thisstructure permits the lether to be distributed in their in
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