936 Transactions of the American Institute. 



Taking all points, the defects as well as advantages of the afore- 

 mentioned processes, into consideration, I have followed an entirely 

 distinct road to arrive at long desired results, the extraction of all 

 the gold, with most advantageous utilization of the refuse. 



By a series of new processes, recently secured by letters patent, 

 I cannot only obtain a complete solution of the quartzose ores in 

 water, but also a complete chemical decomposition of the silica 

 itself, so as to eliminate all that gold that has hitherto been lost, 

 because I believe that it exists in the quartz in chemical combination. 



There are numerous other processes in existence, and I shall take 

 pleasure in mentioning them in a future larger publication on this 

 subject, after my return from an information trip to Europe. 



After some discussion of this paper, the Association adjourned. 



March 19, 1868. 

 Prof. S. D. Tillman in the chair. 

 The Chairman presented the following summary of scientific 

 news: 



ANTIDOTE FOR EXTERNAL POISONING. 



Cyanide of potassium {jpotamarii), extensively used in electro 

 plating and other processes, sometimes produces painful ulcers ob 

 the hands of workmen who use it. A correspondent of the Boston 

 Journal of Chemistry says, experience has taught him that the most 

 effectual remedy in such cases is the proto-sulphate of iron {ferma- 

 sot) in fine powder thoroughly mixed with raw linseed oil. 



THE VOLTAIC ARC. 



In regard to the establishment of the voltaic arc, M. La Eoux 

 states that results similar to those given by induction currents may 

 be obtained with the ordinary currents from voltaic piles. With 

 a nitric acid battery of fifty elements, the current may be inter- 

 rupted for about one-twenty-fifth of a second, and then leap from 

 one carbon element to the other, although they may be one-twelfth 

 of an inch apart. 



BLACK PAINT FOR PHOTOGRAPfflC USES. 



Mr. F. M. Carter has published the following recipe for 

 making a cheap and durable black paint for the inside of dark 

 rooms, camera boxes, slides, &c.: First, dampen lampblack with 



