£ZPERIM£NTB ON ALLANIT£. M 



fated by zinc, while our oxi<I« is thrown down blacW.^ There 

 are other differences between the two, but those which i 

 have just mentioned are the most striking. 



These properties induced me to consider the substance Suppose4 a 

 which 1 had obtained from the Greenland mineral as (he "^^ '"*^*' 

 oxide of a metal hitherto unknown; and 1 proposed to dis- 

 tinguish it by the name oi'junonium. 



In the experiments above detailed, 1 had expended almost Junonium. 

 all the oxide of junonium which I had in my possession, J^ 



taking it for granted, that I could easily procure more df it 

 from the Greenland mineral. But, soon after, I was in» 

 formed by Mr. WoUaston, to whom I had sent a specimen 

 of the mineral, that he had not been able to obtain any of 

 my supposed junonium in his trials. This induced me to 

 repeat the analysis no less than three times, and in neither 

 case was I able to procure any more of the substance, which I 

 described above. Thus, it has been out of my power, to 

 verify the preceding details, and to put the existence of a 

 new metal in the mineral beyond dotibt. At the same time 

 I may be allowed to say, that the above experiments v/ere »miy. ;m'. r > 

 made with every possible attention on my part, and most of ; ' 



them were repeated, at least a dozen time?. I have no , 



^^oubt rayselfiof their accuracy ; butthink that the existence of 

 a new metal can hardly be admitted, without stronger proofs 

 than the solitary analysis which I have performed. 



5. The liquid, thus freed from iron and junonium, was Alumine. 

 supersaturated vith pure ammonia. A grayish white gela- 

 tinous matter precipitated. It was separated by the filter, 



and became gradually darker coloured when drying. This 

 matter, after being exposed to a red heat, weighed about 38 

 grains. When boiled in potash lie, 4*1 grains were dis- 

 solved, of a substance which, separated in the usual way, 

 ,exhibited the properties of alumina. 



6. The remaining 33*9 grains were again dissolved in An oxide, 

 muriatic acid, and precipitated by pure ammonia. The 

 precipitate was separated by the filter, and allowed to dry 

 flpoutaneously in the open air. It assumed an appearance' 

 very much resembling gum arabic, being semitransparent, 

 and of a brown colour. When dried upon the sand-bath, 

 it became very dark brown> broke with a vitreous fracture, 

 and still retained a smaU degree of transparency. It was 



tasteless. 



■ k^^.^^^iH -^^ 



