EVOLUTION BY ATROPHY 



IN BIOLOGY AND SOCIOLOGY 



BY 



JEAN DEMOOR JEAN MASSART 



REGE OF THE FREE UNIVERSITY CHARGE DE COURS OF THK FRI 



OF BRUSSELS UNIVERSITY OF BRUSSELS 



EMILE VANDERVELDE 



PROFESSOR AT THE INSTITUTE OF HAUTES ETUDES OF BRUSSELS 



TRANSLATED BY 



MRS CHALMERS MITCHELL 



LONDON 

 KEGAN PAUL, TRENCH, TRUBNER & CO., LTD. 



PATERNOSTER HOUSE, CHARING CROSS ROAD 

 1899 



