

MIND IN NATURE; 



015 



THE ORIGIN OF LIFE, AND THE MODE OF 



DEVELOPMENT OF ANIMALS. 



BY 



HENRY JAMES CLARK, A.B., B.S. 



ADJUNCT PROFESSOR OF ZOOLOGY IN HARVARD UNIVERSITY, 

 CAMBRIDGE, MASS. 



MEMBER OF THE AMERICAN ACADEMY OF ARTS AND SCIENCES, BOSTON, MASS.; OF THB 



BOSTON SOCIETY OF NATURAL HISTORY; CORRESPONDING MEMBER OF 



THE AMERICAN MICROSCOPICAL SOCIETY OF NEW YORK, ETC., ETC. 



" La naissance des etres organises est done le plus grand mystere de 1'economie 

 organique et de toute la nature ; jusqu'i present nous les voyons se developper, 

 mais jamais se former." CUVIER, Rcgne Animal, 1829. 



WITH OVER TWO HUNDRED ILLUSTRATIONS. 



NEW YORK: 



D. APPLETON AND COMPANY, 



443 AND 445 BROADWAY. 



1865. 



