CONTENTS. 



Scientific Proceedings (69th-76th meetings) : page 



Communications of the sixty-ninth meeting, October 20, 1915 1 



Communications of the seventieth meeting, November 17, 1915 . 29 



Communications of the seventy-first meeting, December 15, 1915 . . 45 



Communications of the seventy-second meeting, January 19, 1916 . . 67 



Communications of the seventy-third meeting, February 16, 1916 . . 83 



Communications of the seventy-fourth meeting, March 15, 1916 ... 99 



Communications of the seventy-fifth meeting, April 19, 1916 . . . 123 



Communications of the seventy-sixth meeting, May 24, 1916 . . . 145 

 Recapitulation of the Names of the Authors and of the Titles of the 



Communications 201 



Executive Proceedings (69th~76th meetings) 213 



Register of Names and Addresses of the Members 217 



List of Officers 224 



Classified List of Members 225 



Index of the Scientific Proceedings 227 



iii 



