vi MICROSOMAL PARTICLES 



The Washington Academy of Sciences has agreed to act as publisher in the 

 hope of demonstrating that this type of book can be brought out rapidly and 

 that it does serve a useful function. 



We wish to thank the Office of Publications of Carnegie Institution of Wash- 

 ington for editorial help in seeing the project through the press. 



D. B. COWIE 



Chairman, Monograph Committee 

 Washington Academy of Sciences 



C. LEVINTHAL 



Chairman, Program Committee 

 Biophysical Society 



R. B. ROBERTS, Editor 



Carnegie Institution of Washington 

 Department of Terrestrial Magnetism 

 5241 Broad Branch Road, Northwest 

 Washington 15, D. C. 



