152 Intelligence and Miscellaneous Articles, 



In his first memoir on fluorine and the fluorides, M. Louyet, guided 

 by various considerations, rejected the hypothesis of Ampfere, in 

 which fluorine is ranged with chlorine, bromine and iodine. The 

 equivalent of chlorine, indicated by the later researches, strengthen 

 this ojjinion ; for whilst the equivalents of chlorine, bromine and 

 iodine, are not exactly divisible by the equivalent of hydrogen, that 

 of fluorine is, on the contrary, a multiple of this equivalent, which 

 associates it with the series of oxygen, sulphur, nitrogen, phosphorus, 

 arsenic and carbon. — L'Institut, Janvier 4, 1849. 



SOLUBILITY OF CHLORIDE OF SILVER IN HYDROCHLORIC ACID. 



M. J. Pierre states hydrochloric acid is capable of dissolving at 

 least l-200dth of its weight of chloride of silver ; and when diluted 

 with twice its weight of water, it is capable of holding l-600dth of 

 its weight of the chloride in solution. — Journ. de Ch. Med. ,Ja.n. 1849. 



PREPARATION OF IODIDE OF ARSENIC. 



M. Meurer proposes the following method of obtaining this com- 

 pound : — :Pass arseniuretted hydrogen gas into a solution of 4 parts 

 of iodine in 120 parts of alcohol until the liquid is decolorized; a 

 fresh quantity of iodine is then to be added, and the current of arse- 

 "niuretted hydrogen is to be again passed through the solution to the 

 same point. The liquid ought not then to become turbid ; but if a 

 brown turbidness should be produced, it mu.st be made to disappear 

 by an addition of iodine. 



By spontaneous evaporation the liquor deposits microscopic hexa- 

 gonal tables, which, according to M. Kuhn's analysis, are iodide of 

 arsenic. — Journ. de Ph. et de Ch., Decembre 1848. 



COMPOSITION OF THE BLACK YTTUO-COLUMBITE OF YTTERBY. 



According to the analysis of M. Peretz, this mineral consists of — 



Columbic acid 58'65 



Yttria 21-25 



Tungstic acid 0*60 



Lime 7*55 



Magnesia 1*40 



Protoxide of uranium .... 3 "94 



Protoxide of iron 6*29 



Oxide of copper 0*40 



100-08 



The density of this mineral at an average temperature is 5*67 ; it 

 becomes 6'40 by calcination. 



M. Rose states, on the occasion of this analysis, that an orthite 

 occurs at Ytterby so much resembling yttro-columbite, that it is 

 impossible to distinguish these minerals from each other by appear- 

 ance. 



According to M. Rose, the columbite of Finland possesses the 

 same composition, density, and metallic acids as the yttro-columbite 

 of YXXQxby.—Ibid. 



