Page:American Journal of Sociology Volume 8.djvu/642

 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^]