CONTENTS. 



Page. 



Scientific proceedings (i8th-24th meetings) : 



Communications of the eighteenth meeting, October 17, 1906 . 1 



Communications of the nineteenth meeting, December-19, 1906 21 



Communications of the twentieth meeting, February 20, 1907 . 31 



Communications of the twenty first meeting, March 20, 1907 . 63 



Communications of the twenty second meeting, April 17, 1907 93 



Communications of the twenty third meeting, May 22, 1907 . 111 



Communications of the twenty fourth meeting, June 22, 1907 . 147 

 Recapitulation of the names of the authors and of the titles of 



the communications . . . . . . . . 163 



Classified list of contributing laboratories . . . . 173 



Executive proceedings (i8th-24th meetings) . . . . 175 



List of officers 178 



Register of names and addresses of the members . . 179 



Classified list of members 183 



Revised constitution and by-laws 185 



Index of the scientific proceedings 189 



(iv) 



