ON GALVANISM. 73 



In the firftinftance the evolution of electricity appears to be Explanation, 

 therefultof a chemical adion of the fulphuric mixture on the 

 zinc, while in the latter, no a6tion is induced on the filvertill 

 feme alteration is efFedtedas to its ele6lrical flate; as we well 

 know from other galvanic experiments, that of zinc and filver, 

 when thus combined, the zinc evinces pofitivefigns, and filver 

 negative ; it is hence evident that an abf]ra61ion of eledlricity 

 from filver is requifite prior to its capability of being adted on 

 by the fulphuric acid. 



If I might prefume to fubmit to fome of your chemical Additional re- 

 readers, an examination of fuch compound of filver as may ™^ 

 thus be efFeded ; a fulphate of filver is a6t;ually formed, it 

 might lead to fome important difcoveries, I am every day 

 more and more perfuaded (hat light and ele6lrlcity are the two 

 moft aftive agents we poffefs, and a more minute enquiry into 

 their refpeflive energies, I have no doubt, would enable us to 

 explain many phyfical changes in the material world, with 

 which we are at prefent perfe6tly unacquainted. 



The very intenfe light difengaged from charcoal by means intenfe light 

 of my ^extenfive apparatus, has occafioned me to be frequently ^'^°^ galvanic 

 honoured with the attendance of Dr. Herfchell ; from fome 

 converfation I have had with him, I am in hopes he will be in- 

 duced to inllitute fome experiments relative to the evolution of 

 light, fo nearly approaching to folar light. If thefe fliould be 

 conduced, I Qiall do rayfelf the honour of ftating them to the 

 public through the medium of your valuable Journal. 



III. 



On the Formation of Snow. % G. A. 

 To Mr. NICHOLSON. 



SIR, 



JL HE remarks contained in the enclofed pages, may not, 

 perhaps, evince any originality of thought, nor more than would 

 occur to the niofl fuperficial obferver; yet the fuggeftions of 

 fome perfons, frequently lead to the obfervation of valuable 

 fa6ls by others. Therefore, Sir, you will make whatever ap- 

 plication of the paper you confider befl. 



If 



