LIST OF CONTRIBUTORS 



George L. Clarke, Ph.D. 



Instructor and Tutor, Department of Biology, 



Harvard University, Caml)ridge, Mass.; 



Junior Biologist, Woods Hole Oceano- 



graphic Institution, Woods 



Hole, Mass. 



Frank E. Eggleton, Ph.D. 



Associate Professor of Zoology, University of 

 Michigan, Ann Arbor, Mich. 



F. E. J. Fry, Ph.D. 

 Ontario Fisheries Research Laboratory, Depart- 

 ment of Biology, University of Toronto, 

 Toronto, Out., Canada 



Robert W. Pennak, Ph.D. 



Instructor in Zoology, University of Colorado, 

 Boulder, Colo. 



G. AY. Prescott, Ph.D. 



Associate Professor of Biology, Albion College, 

 Albion, Mich. 



D. S. Rawson, Ph.D. 



Professor of Biology, University of Saskatchewan, 

 Saskatoon, Sask., Canada 



AYiLLis L. Tressler, Ph.D. 



lusliuctor in Biology, University of Buffalo, 

 Buffalo, N. Y. 



Arthur T. Henrici, M.D. 



Professor of Bacteriology and Immunology, Uni- 

 versity of Minnesota, Minneapolis, Minn. 



L. R. Wilson, Ph.D. 



Associate Professor of Geology and Botany, 

 Coe College, Cedar Rapids, Iowa 



