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Updated: May 13, 2025
Another uniformity is that called the law of isomorphism; the identity of the crystalline forms of substances which possess in common certain peculiarities of chemical composition. Thus it appears that even heteropathic laws, such laws of combined agency as are not compounded of the laws of the separate agencies, are yet, at least in some cases, derived from them according to a fixed principle.
It was proved in 1819 that the capacities for heat which belong to the atoms of the different elements are equal. In the same year Mitscherlich's law was propounded, the law of isomorphism, according to which atoms of elements of the same class may replace each other in a compound without altering its crystalline structure.
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