rpis.] MINUTES. 



Vll 



" The Hall and Corbino Effects," by Edwin Plimpton Adams, 

 Professor of Physics, Princeton University. (Introduced by 

 Prof. Magie.) 



" Spontaneous Generation of Heat in Recently Hardened Steel," 

 by Charles Francis Brush, Ph.D., Sc.D., LL.D., of Cleveland. 



" Ruling and Performance of a Ten Inch Diffraction Grating," 

 by A. A. Michelson, Ph.D., Sc.D., LL.D., Head of Depart- 

 ment of Physics, University of Chicago. 



Friday, April 2^. 



Morning Session — c).^^ o'clock. 



William W. Keen, M.D., LL.D., President, in the Chair. 



The following papers were read : 



" Heredity in Protozoa," by M. H. Jacobs, Ph.D., Assistant 

 Professor of Zoology, University of Pennsylvania. (Intro- 

 duced by Prof. McClung.) 



" The Constitution of the Hereditary Material," by T. H. 

 Morgan, Ph.D., Professor of Experimental Zoology, Colum- 

 bia University, New York. (Introduced by Prof. E. G. 

 Conklin.) Discussed by Prof. Conklin. 



"The Problem of Adaptation as Illustrated by the Fur Seals of 

 the Pribilof Islands " (illustrated by lantern slides) , by George 

 H. Parker, Sc.D., Professor of Zoology, Harvard University. 

 Discussed by Professors Conklin and Cattell. 



"An Interpretation of SteriHty in Hybrids," by Edward M. 

 East, Ph.D., Professor of Experimental Plant Morphology, 

 Harvard University. (Introduced by Prof. Bradley Moore 

 Davis.) 



" Heterosis and the Effects of Inbreeding," by George H. 

 Shull, Ph.D., Botanical Investigator, Station for Experi- 

 mental Evolution, Carnegie Institution. (Introduced by 

 Prof. Bradley M. Davis.) 



" The Significance of Sterility in Oenothera," by Bradley M. 

 Davis, Ph.D., Professor of Botany, University of Penn- 

 sylvania. 



