VOL. V No. 3 



JOHNS HOPKINS UNIVERSITY 



BALTIMORE 



■^^^^^^^^ of Mottiafai 

 STUDIES S^ond Libmry 



FROM THE 



BIOLOGICAL LABORATORY 



EDITED BY 



Professor H. n. MARTIN 



Professor WILLIAM K. BROOKS 



SALPA IN ITS RELATION TO THE EVOLUTION 



OF LIFE 



By WILLIAM K. BROOKS, Ph. D. 



BALTIMORE 



THE JOHNS HOPKINS PRESS 

 May, 1893 



