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May 16, 1891


JAMA. 1891;XVI(20):697-702. doi:10.1001/jama.1891.02410720013003

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THE CHEMICAL FACTORS IN THE CAUSATION OF DISEASE.  A Course of Three Lectures delivered at the Post-Graduate Medical School of Chicago, March 26, 27 and 28, 1891.BY VICTOR C. VAUGHAN, M.D., Ph.D., OF ANN ARBOR, MICH.PROFESSOR OF HYGIENE AND PHYSIOLOGICAL CHEMISTRY AND DIRECTOR OF THE HYGIENIC LABORATORY IN MICHIGAN UNIVERSITY.LECTURE III.—THE AUTOGENOUS DISEASES.All living things are composed of cells. The simplest forms of life are unicellular, and in these all the functions of life devolve upon the single cell. Absorption, secretion and excretion must be carried on by the same cell. A collection of unicellular organisms might be compared to a community of men with every individual his own tailor, shoemaker, carpenter, cook, farmer, gardener, blacksmith, etc. However, only the lowest forms of life are unicellular; all others are multicellular. In the higher animals there is a differentiation not only in the size and structure of

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