OF ARTS AND SCIENCES. 416 



The following papers were presented : — 



" Superficial Tension at Low Temperatures." By N. D. C. 

 Hodges.^ 



" Palceozoic Myriapods as Types of a New Order." By 

 S. H. Scudder. 



" Relation between the Imperial Yard, Bronze No. 1, and 

 the Metre of the Archives." By W. A. Rogers. 



" On the Conditions for Accuracy in Measuring the Angle 

 between two Reflecting Surfaces." By J. Rayner Edmands. 



The Recording Secretary read the following paper : — 



" On the Distribution of Heat in the Diffraction Spectrum." 

 By S. P. Langley. 



Remarks on this paper were made by Professors Cooke and 

 Dolbear. 



The following papers were presented by title : — 



" On Chlorbromacrylic Acids and Diiodbromacrylic Acid." 

 By C. F. Mabery and Rachel Lloyd. 



" Memoir on Phosphorescence." By John W. Draper. 



Professor Dolbear read the following papers : — 



" On tlie Physical Theory of Gravitation." 



" On the Amplitude of Atomic Motions." 



Seven hundred and thirty-seventh Meeting. 



January 12, 1881. — Stated Meeting. 



The Academy met at the house of Mr. Henry P. Kidder, 

 2 Newbury Street, Boston. 



The President opened the meeting with the following ad- 

 dress : — 



"In a letter, dated July 12, 1796, addressed to the lion. Johu 

 Adams, then President of tlie Academy, Count Rumford gave notice 

 of the trust Avhich he had committed to their administration. Since 

 1797, when the funds indicated in this letter were received, the Acad- 

 emy has not failed in earnest endeavors to comply with the conditions 

 of the trust. At the annual meeting of 1799, it was voted that the 



