OF ARTS AND SCIENCES. 397 



The chair announced the death of Saint-Julien Ravenel, of 

 Charleston, Associate Fellow of the Academy. 



The following papers were presented : — 



" On the Young Stages of some Osseous Fishes. Part III." 

 By Alexander Agassiz. 



" Wages as a Standard of Cost." By Edward Atkinson. 



" On the Construction and Comparison of Three Standard 

 Metres." By William A. Rogers. 



" Note on Thermodynamics." By John Trowbridge. 



" On a Modification of the Micrometer Level." By J. Ray- 

 ner Edmands. 



" On the Spirit-Level considered as an Instrument of Pre- 

 cision." By William A. Rogers. 



" On the Colors and Patterns of Insects." By Hermann A. 

 Hagen. 



" On the Conditions of Electric Lighting." By N. D. C. 

 Hodges. 



Seven hundred and fifty- second Meeting. 



May 10, 1882. — Monthly Meeting. 



The President in the chair. 



The President announced the death of Henry Wadsworth 

 Longfellow, Ralph Waldo Emerson, and Charles Robert 

 Darwin. 



Dr. Gray referred to a communication from Mr. Winthrop, 

 who represented the Academy at Darwin's funeral, and who 

 mentioned that another Fellow of the Academy, Mr. Lowell, 

 U. S. Minister, was also present. 



The following papers were presented : — 



" On Telegraphing over Great Distances." By N. D. C. 

 Hodges. 



" On the Limit of Visibility of Fine Lines Ruled on Glass." 

 By William A. Rogers. 



The following papers were presented by title : — 



" On the Wedge Photometer." By Edward C. Pickering. 



