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In the study of the normal and pathologic events occurring in the skin, dermatologists no longer content themselves with the minute, faithful portrayal of the tissue changes presented by a histologic section. The description of the morphologic observations is supplemented with interpretations of the living processes accompanying and producing the alterations of the cellular architecture.
Unna was one of the first to engage in these investigations, and in the book under consideration he presents a survey of his contributions to the subject of the "Histochemistry of the Skin."
Applying to his own domain: the study of the skin, the basic principles of Ehrlich's "Farbenanalyse," that is, the analysis of the microchemical reactions of the tissues with the aid of stains, Unna endeavors to transform the histology of the skin into an experimental, intracellular chemistry of this organ.
In his task of eliciting the meaning of the biologic processes Unna does