Vol. V No. 3 



JOHNS HOPKINS UNIVERSITY 



BALTIMORE 



STUDIES 



olMollHsks 



FROM THE ^■'^' •■ ■ T'TTy 



BIOLOGICAL LABORATORY 



EDITED BY 



Professor h. n. MARTIN 



Professor WILLIAM K. BROOKS 



SALPA. IN ITS RELATION TO THE EVOLUTION 



OF LIFE 



By WILLIAM kV BROOKS, Ph. D. 



S?MTHSOW(^ 



APR 1 5 1988 



BALTIMORE 



THE JOHNS HOPKINS PRESS ^»^'fiRARlES 



May, 1893 



