Eugenio Rignano 
UPON THE 
Inheritance of Acquired 
Characters 
A HYPOTHESIS OF HEREDITY, DEVELOPMENT, 
AND ASSIMILATION 
AUTHORIZED ENGLISH TRANSLATION 
BY 
BASIL C. H. HARVEY 
ASSISTANT PROFESSOR OF ANATOMY, UNIVERSITY OF CHICAGO 
WITH AN APPENDIX 
UPON THE MNEMONIC ORIGIN AND NATURE 
OF THE AFFECTIVE OR NATURAL TENDENCIES 
CHICAGO 
THE OPEN COURT PUBLISHING CO. 
IgII 
L: 
