INFLUENCE OF GALVANISM ON MINERALS. QQ3 



tfition of boracic acid, whence they have deduced different to decompose 



boracic acid, 

 consequences. 



Fabroni asserted, that this acid was only a modification of 

 the muriatic. See Fourcroy's Chemistry, art. Boracic 

 Acid. 



In the Annales de Chimie, vol. XXXV, p. 202, we find a 

 long series of experiments on the phenomena exhibited by 

 boracic acid on treating it with oximuriatic acid. These Supposed to 

 experiments are by Crejl, who inferred from them, that bonm l 

 carbon was one of the elements of this acid, 



Lastly, Mr. Davy, subjecting moistened boracic acid to 

 the Voltaic pile, observed traces* of a black combustible 

 matter at the negative pole; but he says, that being occu- 

 pied in researches upon the alkalis, he was unable to follow 

 up this observation. See Mr. Davy's paper, which arrived 

 in France two months ago, and an abstract of which was in- 

 serted in the Bulletin de la Socitte Philomatique for the month 

 of November. 



Thus hitherto the principles ef the boracic acid were not 

 known. It is true, we had announced to the Institute, 

 that this acid contained oxigen, and consequently a combus- 

 tible substance; but, as we had not recomposed it, we did 

 not consider its nature as determined. 



IV. 



On the Influence of Galvanic Electricity on the Transition 

 of Minerals; read at the Meeting of the Mathematical 

 and Physical Class of the Institute, the 13th of July, 

 1807; by Mr, GuYTONf. 



o. 



'N examining five years ago a native oxide of antimony Native oxide 

 found in the province of Gallicia, which had been sent me ot antimony 

 by Mr. Angulo", inspector general of the mines of Andalu- phu^™ 1 " 



* Mr. Davy's own expressions are : <c 1 find, that a dark coloured com- 

 " *bustible matter is evolved at the negative surface." S?e Journal, vol. 

 XX, p. 351. 



f Annales ds Chimie, vol.LXIJI, p. 113. 



sia, 



