96 PROCEEDINGS OF THE AMERICAN ACADEMY 



A bronze medal struck in memory of the late Frederick 

 Thiersch, presented by the Royal Bavarian Academy, was 

 received and exhibited. 



Professor H. J. Clark made a detailed communication upon 

 the group of MedusjB of which Lucinaria is the type, — a 

 group which he finds now to consist of two families and seven 

 if not eight genera, the characters and structure of which were 

 illustrated. 



Dr. Dexter made a communication upon Revolving Storms, 

 in particular upon one of June last, which he had observed 

 and investigated. 



Mr. Safford remarked upon certain forms of personal equa- 

 tions. 



Professor B. Peirce commented upon certain remarks upon 

 the American Lunar Tables contained in a recent volume of 

 the Transactions of the Royal Astronomical Society. 



Five Jiiindred and seventeenth meeting. 



January 28, I860. — Statute Meeting. 



The President in the chair. 



The Corresponding Secretary read letters relative to the 

 exchanges of the Academy. 



An artist's proof of Mr. Marshall's engraving of Stuart's 

 portrait of Washington, presented by the engraver, was ex- 

 hibited, and ordered to be appropriately framed. 



On motion of Mr. Folsom, the thanks of the Academy were 

 voted to Mr. Wm. E. Marshall for this valuable donation. 



Capt. Henry L. Abbot, U. S. Topographical Engineers, was 

 elected a Fellow, in Class I., Section 4. 



Wm. W. Story, Esq., was elected a Fellow in Class III., 

 Section 4. 



General A. A. Humphreys, U. S. A., was elected an Asso- 

 ciate Fellow, in Class I., Section 4. 



Christopher Hansteen, of Christiania, Norway, was elected 

 a Foreign Honorary Member, to fill the vacancy left in Class 

 L, Section 3, by the death of Biot. 



