AUTHOR'S ACKNOWLEDGMENTS 



I am indebted to Professor L. J. Henderson for early 

 calling my attention to the problem of size regulation in 

 organisms. Professor H. S. Jennings and Professor 

 Max Hartmann stimulated an acquaintanceship with uni- 

 cellular organisms and pointed out some of the illustra- 

 tions of size modification. The Guggenheim Foundation, 

 the Kaiser Wilhelm-Institut fur Biologie, and the Uni- 

 versity of Rochester furnished the opportunities to col- 

 lect and correlate the information represented in this 

 volume. My colleagues Professor W. O. Fenn and Pro- 

 fessor Stanhope Bayne- Jones took pains to discuss and 

 verify numerous points that are included in the text. 

 Members of the administrative staff of the School of 

 Medicine and Dentistry assisted in the technical prepara- 

 tion of the volume. Obligation is acknowledged to the 

 investigators and publishers whose work has been drawn 

 upon in the charts and tables. 



E. F. Adolph 



