3 cadet's fuming liguor. 



fo that he could eafiiy break it againd the fides of the veffcf. 

 The vapours vvere not perceptible when he ufed carbonic acid 

 perfectly dried; whence lie concluded, that the vapours of 

 the arfenical liquor are owing to an abforption of the oxigen 

 and the water contained in the air jointly, but that the firft of 

 thefe catufe's feems to be more powerful than the fecond. 

 Its property of From this it fhould feem that the arfenical liquor is poffeffed 

 inflaming fpon- f t j ie property of inflaming alone. Il does not however lake 

 taneoufly is ow- , , n ■ ■ 



ing to metallic fire at the approach of a body in combudion, when it is very 

 arfenic pure; and it is obferved, that, in all the fpontaneous inflam- 



mations which it experiences, the combudion always begins 

 at the black fpecks which difturb its tranfparency, and are 

 only metallic arfenic very much divided. 

 It mu ft there- It now remained to determine the nature of the arfenical 

 ore ^contain ar- jjq Uor> j ts oc j OLir} which refembles arfcniated Iiidrogen gas, 

 indicated that it mud contain arfenic, and that this metal 

 mud have great influence on the phenomena which it offers: 

 Its combuftibility, its confidence, and its appearance, indi- 

 an oily matter, cated an oily matter; and, although it did not change the 

 tincture of tumfole, and no re-agent demondrated immedi- 

 and acetous acid; ately the exidence of acetous acid, this body mud neverthe- 

 butthis was not lefs be expe&ed in it. To fucceed in infulating thefe difi'er- 

 indicated by al-. ent f u b|j ances the author tried the alkalies; but experience 

 kalies. • 



foon convinced him that he mud have recourfe toother means. 



Oxigenated mu- He employed the oxigenated muriatic acid with much greater 



iiatk acid de- fuccefs. Some drops of the liquor, poured into this gas, were 



indantly inflamed, and their decompofition was complete. 



They were then precipitated in white flecks by lime-water, 



Formed a foli- arj d in yellow ones by fulphu rated hidrogen; while, on being 



ated fait with faturated with potafh and evaporated, they formed a foliated 



p / fait, flrongly attracting the humidity of the air, acrid, tharp, 



decompofable by fulphuric acid, and difengaging a drong 



odour of vinegar. The quantity of arfenic and of acetous 



acid obtained, being far from correfponding with the quantity 



of liquor which had been ufed, there mud therefore have been 



Its folution in another body in it which it was requifite to infulate, and (his 



water, decom- was accomplifhed by treating a new portion of the liquor with 



pofed by fulphu- ;. * . r en ■ irr , i , 



rated hidrogen, a quantity or water lufhcient to diffolve it ; then on decom- 



yielded fulphur, pofing it by fulphurated hidrogen, it yielded a precipitate, 



nine ace- u 'g' lt 'y yellow, very much divided, formed principally of 



tous acid. arfenic and fulphur, which was a conikierable time in fepa- 



ratine 



