X Preface 



C. A. Berger, A. M. Brues, Joseph Carlson, George L. Cross, Agnes 

 W. Eigsti, M. Fauconnier, M. E. Gaulden, Tilman Johnson, H. Kihara, 

 Carol S. Lems, A. Lonert, E. Lotens, Marjorie Lindholm, Elizabeth 

 McKee, Portia M. Mercier, Leona Schnell, Barbara Tenney Sherman, 

 Marselda Scarff, Harvey Smith, Herbert Taylor, Atlee S. Tracy, Ruth 

 VV^itkus, Vera Williamson, Nancy Gay-Winn. 



Scientists around the world gave us unpublished materials, refer- 

 ences, and specific aid toward the manuscript. We acknowledge the 

 help of the following: John Beal, C. A. Berger, P. Bhaduri, Muriel 

 Bradley, James Brewbaker, Max E. Britton, Meta S. Brown, A. M. 

 Brues, Otto Bucher, Joseph Carlson, Belayet H. Choudhury, Jens 

 Clausen, J. W. Cook, Geo. H. Conant, Alan Conger, Geo. L. Cross, 

 George Darrow, Haig Dermen, Sam Emsweller, Rob't. K. Enders, K. 

 Frandsen, D. U. Gardner, Mary E. Gaulden, Pierre Gavaudan, C. J. 

 Gorter, Ake Gustafson, A. Hecht, E. K. Ammal Janaki, Tilman John- 

 son, A. Josefson, Theo Just, H. Kihara, Peo Koller, Ernest Lahr, Hans 

 Lettre, Albert Levan, S. Lodhi, James Loudon, P. Maheswari, G. P. 

 Majumdar, Ralph G. Meader, Arne Muntzing, A. Mohajir, B. R. 

 Nebel, Fredrich Nilsson, I. Nishiyama, Gosta Olsson, Joseph O'Mara, 

 Gunar Ostergren, B. Pal, Barbara Palser, Joseph Peters, S. Ramanu- 

 jam, F. Ramirez, M. L. Ruttle, Leona Schnell, E. R. Sears, Paul 

 Sentein, Barbara Tenney Sherman, H. Shimamura, H. Slizynska, B. 

 Slizynski, Harold H. Smith, Paul F. Smith, Leon Snyder, Leon Steele, 

 G. Ledyard Stebbins, Jr., S. G. Stephens, Robert N. Stewart, R. R. 

 Stewart, Betty Thomson, Geo. Tischler, Paul Voth, B. Wada, Hanford 

 Tiffany, L E. Jeffs, S. J. Wellensiek, M. Westergaard. 



O. J. Eigsti 



Pierre Dustin, Jr. 



October, 1954 



