viii MINUTES. 



" The Dynamics of Antagonism," by W. J. V. Osterhout, A.M., 

 Ph.D., Professor of Botany, Harvard Univ. (Introduced 

 by Prof. Davis.) 



"Jointing as a Fundamental Factor in the Degradation of the 

 Lithosphere," by Frederick Ehrenfeld, Ph.D., Assistant Pro- 

 fessor of Geology, University of Pennsylvania. (Introduced 

 by Prof. Amos P. Brown.) 



" Sinking Islands versus a Rising Ocean in the Coral-Reef 

 Problem," by Wilham Morris Davis, Sc.D., Ph.D., Profes- 

 sor Emeritus of Geology, Harvard University. 



" The Petrology of Some South Sea Islands and its Signifi- 

 cance," by Joseph P. Iddings, Sc.D., late Professor of Petrol- 

 ogy, University of Chicago. 



" Coal Formation," by J. J. Stevenson, Ph.D., LL.D., Emeritus 

 Professor of Geology, New York University. 



" California Lakes and the Solar Hypothesis of Climatic 

 Changes," by Ellsworth Huntington, M.A., Ph.D., Assistant 

 Professor of Geography, Yale University. (Introduced by 

 Mr. Henry G. Bryant.) 



" Color Photographs of the Phosphorescence of Certain Sul- 

 phides," by Edward L. Nichols, Ph.D., LL.D., Professor of 

 Physics, Cornell University. 



Afternoon Session — 2 o'clock. 



William B. Scott, Sc.D., LL.D., Vice-President, in the Chair, 

 The following papers were read : 



"A New and Very Sensitive Indicator for Acidimetry and 

 Alkalimetry and for Determining Hydrogen Ion Concentra- 

 tions between the Limits of 6 and 8 on the Sorensen Scale," 

 by G. Scatchard and Marston T. Bogert, Ph.B., LL.D., Pro- 

 fessor of Organic Chemistry, Columbia University. 



" Bacterio-chemical Studies of Decay of the Teeth," by Wil- 

 liam J. Gies, Ph.D., Professor of Biological Chemistry, Co- 

 lumbia University. 



" The Human Gastric Secretion," by Martin E. Rehfuss, M.D., 

 Research Associate in Physiological Chemistry, Jefferson 



