Vlll 



PREFACE 



Special gratitude is expressed to Dr. Seiig Hecht, who encouraged the 

 work at its start, and to Dr. Hans Gaffron, who has read and criticized 

 it in its final form. My teacher and friend, Dr. James Franck, has spent 

 many hours in patiently discussing with me the kinetics of photosyn- 

 thesis — a subject treated in the second volume. I am indebted to my 

 coworkers on the Solar Energy Project, Dr. Leo F, Epstein (now Captain 

 in the U. S. Army Air Force) and Mr. Ely Burstein, for having read and 

 corrected the manuscript in its consecutive versions. My thanks are 

 also due to several friends and colleagues for reading and criticizing single 

 chapters or sections of the book— to Dr. R. Emerson at the California 

 Institute of Technology, Drs. G. Scatchard, L. Heidt, and W. Stock- 

 mayer at the Massachusetts Institute of Technology, G. Wald at Harvard 

 University, and W. J. V. Osterhout and S. Granick at the Rockefeller 

 Institute for Medical Research. During the years in which this book 

 grew, and particularly on the occasion of two symposia on photosyn- 

 thesis, sponsored by the American Association for the Advancement of 

 Science at Columbus in 1939 and at Gibson Island in 1941, I had an 

 opportunity to discuss the subject with many investigators involved in 

 its advance in recent years. They cannot all be enumerated here, but 

 all have contributed to this book in some measure. 



Chicago 

 April 1945 



Eugene I. Rabinowitch 



