60 PROCEEDINGS OF THE WASHINGTON MEETING 



ANNUAL DINNEE 



The annual dinner of the Society was held at Rauscher s, about 227 

 persons participating. Dr. John M. Clarke acted as toastmaster and the 

 speakers of the evening were Messrs. William 1ST. Rice, H. P. Gushing, 

 Frank D. Adams, Charles D. Walcott, George 0. Smith, W. G. Miller, 

 and Joseph Barrell. 



Session op Wednesday, December 29 



The Society convened at 9.15 o'clock a. m., with President Coleman in 

 the chair. 



REPORT OF AUDITING COMMITTEE 1 



The Auditing Committee begs to report that they have examined the 

 papers and vouchers of the Treasurer and find them to be correct and in 

 good order. 



The investment securities will be examined at a later date. 



John E. Wolff, 

 George H. Perkins, 



For the Committee. 

 The report was accepted. 



The printed report of the Council was then taken from the table and, 

 on motion, accepted. 



The Society then took up the consideration of scientific papers. 



TITLES AND ABSTRACTS OF PAPERS PRESENTED BEFORE THE MORNING 

 SESSION AND DISCUSSIONS THEREON 



FERROUS IRON CONTENT AND MAGNETIC PROPERTIES OF THE NATURAL 

 OXIDES OF IRON AS AN INDEX TO THEIR ORIGIN AND HISTORY 



BY K. B. SOSMAN AND J. C. HOSTETTER 2 



(Abstract) 



Practically all natural iron oxide contains more or less ferrous iron, the 

 percentage varying from a few hundreths of 1 per cent up to the percentage 

 found in magnetite. The magnetic susceptibility likewise varies over a very 

 wide range and depends in part on the ferrous iron content. By measuring 



1 Under date of February 19, 1916, Edward B. Mathews reports that, acting as a mem- 

 ber of the Auditing Committee of the Society, he examined the Society's securities in the 

 hands of the Treasurer and found them to he as listed in the Treasurer's report under 

 date of December 1, 1915. 



2 Introduced by Arthur L. Day. 



