CONTRIBUTORS 



L. G. BARTH, Ph.D. 



Professor of Zoology, Columbia Univer- 

 sity, New York, New York. 



GERHARD FANKHAUSER, Ph.D. 



Professor of Biology, Princeton Univer- 

 sity, Princeton, New Jersey. 



N. J. BERRILL, Ph.D., D.Sc, F.R.S., F.R.S.C. 



Strathcona Professor of Zoology, McGill 

 University, Montreal, Quebec. 



VIKTOR HAMBURGER, Ph.D. 



Professor of Zoology, Washington Uni- 

 versity, St. Louis, Missouri. 



DIETRICH BODENSTEIN, Ph.D. 



Insect Physiologist, Medical Laborato- 

 ries, Army Medical Center, Maryland. 



EDGAR J. BOELL, Ph.D., D.Sc. 



Ross Granville Harrison Professor of Ex- 

 perimental Zoology, Yale University, 

 New Haven, Connecticut. 



ROBERT KYLE BURNS, Ph.D., D.Sc. 



Staff Member, Department of Embryol- 

 ogy, Carnegie Institution of Washington; 

 Honorary Professor of Zoology, The 

 Johns Hopkins University, Baltimore, 

 Maryland. 



JOHANNES HOLTFRETER, Ph.D. 



Professor of Zoology, The University of 

 Rochester, Rochester, New York. 



FLORENCE MOOG, Ph.D. 



Associate Professor of Zoology, Washing- 

 ton University, St. Louis, Missouri. 



J. S. NICHOLAS, Ph.D. 



Sterling Professor of Biology, Yale Uni- 

 versity, New Haven, Connecticut. 



JANE M. OPPENHEIMER, Ph.D. 



Professor of Biology, Bryn Mawr College, 

 Bryn Mawr, Pennsylvania. 



W. M. COPENHAVER, Ph.D. 



Professor of Anatomy, College of Physi- 

 cians and Surgeons, Columbia Univer- 

 sity, New York, New York. 



MARY E. RAWLES, Ph.D. 



Research Associate (Embryology), De- 

 partment of Biology, The Johns Hopkins 

 University, Baltimore, Maryland. 



DONALD P. COSTELLO, Ph.D. 



Kenan Professor of Zoology, University 

 of North Carolina, Chapel Hill. 



HANS RIS, Ph.D. 



Professor of Zoology, University of Wis- 

 consin, Madison. 



WILLIAM ETKIN, Ph.D. 



Associate Professor of Biology, The City 

 College, New York, New York. 



DOROTHEA RUDNICK, Ph.D. 



Professor of Biology, Albertus Magnus 

 College, New Haven, Connecticut. 



