THE ORIGIN OF LIFE 

 ON THE EARTH 



A. I. OPARIN 



ACTIVE MEMBER OF THE ACADEMY OF SCIENCES 

 OF THE U.S.S.R. 



THIRD REVISED AND ENLARGED EDITION 



Translated from the Russian 

 by 



ANN S YN GE 



ACADEMIC PRESS INC., PUBLISHERS 

 NEW YORK • 1957 



