Trans. N. V. Ac. Set. 2 OcL 8, 



The President remarked that the Isle Royale Mine was the 

 second locaUty in the Lake Superior region at which the copper 

 sulphide has yet been found. The carbonate and silicate of cop- 

 per occurred there only in crusts, while the native silver and cop- 

 per, whose abundance is well known, are precipitates from chemi- 

 cal solution by electrolysis. 



Prof. Martin mentioned the recent death, at Hamburg, of Dr. 

 Theodore H. Tellkampf, a member of the Academy, and re- 

 ferred to his valuable studies and papers on the ascidians of our 

 coast. 



Mr. A. R. CoNKLiNG briefly explained the Patio and Cazo pro- 

 cesses for amalgamating silver ores. 



The President suggested that the costly mills and stamps, now 

 used for reducing silver ores, must give way largely to simpler and 

 cheaper machinery and methods employed in the leaching 

 process. 



October 8, 1883. 

 Section of Physics. 

 The President, Dr. J. S. Newberry, in the Chair. 

 Sixty-five persons present. 



Mr. B. B. Chamberlin exhibited a specimen of graphite from a 

 boulder found on the bluff at Weehawken, the first discovered in 

 the vicinity of this city, and probably derived from the outcrop 

 at Bloomingdale, N. J., — also specimens of graphite from Hull, 

 Canada ; Mr. G. F. Kunz, a curious specimen of capped or 

 penetrated beryl, in which a pyramidal crystal of that mineral was 

 enclosed within another of the common hexagonal form, from the 

 topaz locality at Stoneham, Me. ; and the President, a specimen 

 of native lead from the AVood River region of Idaho, the mineral 

 occurring in the upper portions of the veins, associated with red 

 oxide of lead, and solid unchanged galena, in masses of quite 

 unprecedented size. 



The recent death of a Resident Member, Mr. H. G.. Chapman, 

 was announced, and also, in last August, of Mr. Edward Prime 

 of Riverdale, one of the early members and a subscriber to the 

 original building fund. 



