Abstract
A scheme of systematization of organic crystals is proposed on the basis of morphotropism. The organic crystal structures are classified into two main families, Fm3m and Pbca, whose prototypes are provided by methane and benzene respectively. The system of organic crystals is made up from these prototypes by chemical substitutions frequently accompanied by descent in symmetry of the crystal structures by way of the isotranslational subgroups. The Pbca family is predominant in organic molecular crystals. Polymorphism suggests the pedigree relation for descent or ascent in symmetry. The concept of an extended isomorphism is proposed to describe the crystallographic pedigree of organic compounds.
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