< Page:American Journal of Sociology Volume 8.djvu
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622 THE AMERICAN JOURNAL OF SOCIOLOGY
face of the organic mass of a covering or membrane more or less distinct from this mass. This is the first and fundamental differ- entiation of every organism. The succeeding differentiation is the formation of a nucleus in the little mass of protoplasm.
G. DE GREEK.
BRUSSELS, BELGIUM.
[To be continued^]
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