396 PBOCEEDINGS OF THE AMERICAN ACADEMY 



Seven hundred and fiftieth Meeting. 



March 8, 1882. — Stated Meeting. 



The President in the chair. 



The Secretary of the Society of Arts having received a 

 letter from General Hazen, Chief Signal Officer, U. S. A., 

 in which the co-operation of that Society with the weather- 

 service was invited, was instructed by the Society to ascertain, 

 informally, whether the American Academy of Arts and Sci- 

 ences, being the older and more strictly scientific body, would 

 relieve the Society of Arts from the invited responsibility. 



The following Committee was appointed by the chair to 

 consider the proposition of the Society of Arts and to confer 

 with the Society in regard to General Hazen's letter : — 



William Watson, Chairman. 

 Edward C. Pickering, William H. Niles. 



The following papers were presented : — 



" On the Absorption of Light by Glass." By Edward C. 

 Pickering. 



" Ancient Peruvian Pottery, with Reference to the Char- 

 acteristic Art of the People." By F. W. Putnam. 



" Calibration of Thermometers." By Silas W. Holman, 

 presented by Professor Charles R. Cross. 



" The Crystalline Form of Tribromacrylic Acid." By W. 

 H. MelvHle (by title). 



Seven hundred and fifty-first Meeting. 



April 12, 1882. — Monthly Meeting. 



The President in the chair. 



The Council recommended that the name of Frederick W. 

 Putnam be transferred from Class II., Section 3, to Class 

 III., Section 2. The Academy confirmed this recommen- 

 dation. 



