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EVOLUTION BY ATROPHY

IN BIOLOGY AND SOCIOLOGY

.BY

JEAN DEMOOR
AGRÉGÉ OF THE FREE UNIVERSITY OF BRUSSELS

JEAN MASSART
CHARGÉ DE COURS OF THE FREE UNIVERSITY OF BRUSSELS

ÉMILE VANDERVELDE

PROFESSOR AT THE INSTITUTE OF HAUTES ÉTUDES OF BRUSSELS

TRANSLATED BY

MRS. CHALMERS MITCHELL

NEW YORK
D. APPLETON AND COMPANY

coc 592.4

9

Nine

Authorized Edition.

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