128 PROCEEDINGS OF THE AMERICAN ACADEMY 



being to show, that the recent application of rifling to cannon 

 is especially adyantageous for increasing the size and power of 

 guns made upon tlie principle proposed by him in the former 

 memoir. 



Professor W. B. Rogers exhibited a new form of electropho- 

 rus, made of vulcanite, by Mr. Cornelius of Philadelphia, 

 which has the advantage of working perfectly in damp as well 

 as in dry weather. He also showed an adaptation of the same 

 apparatus in anotlier form, for the lighting of gas-lamps. 



Professor B. Peirce discoursed on the mathematical prop- 

 erties of the elastic sac, which he thought had some bearing 

 upon physiological problems. 



Five buudred and twenty-second fleeting. 



May 26, 1863. — Annual Meeting. 



The President in the chair. 



The Corresponding Secretary, on the part of the Council, 

 read the following Report : — 



Upon a I'evision by the Council of the roll of the Academy, it 

 appears that six Fellows, two Associate Fellows, and two Foreign 

 Honorary Members have been elected into this Society during the 

 past year. 



On the Foreign list, Christopher Hansteen was chosen to fill the 

 vacancy left by the death of the venerable Biot, in the First Class 

 and Leopold von Ranke, in place of the late Sir Francis Palgrave, in 

 the Third Class. 



The two Associate Fellows, Professor Newton and General Hum- 

 phreys, are both of the First Class. 



Of the six resident Fellows, four were assigned to the First Class, 

 one to the Second, and one to the Third Class. 



Nine of our members, — the same number as last year, — viz. two 

 Foreign Honorary Members, four Associate, and three Resident Fel- 

 lows, have deceased during the year, or at least since the last Annual 

 Report was drawn up. 



