34? COMBINATION OF MERCURY 



was collected in the neck of the vefTel. After 

 breaking the retort, a portion of arfenic and cor. 

 rofivc fublimate was found, but fo fur fcparate 

 from each other, that they could be diilinguiih- 

 ed by the form of their cryflals. The reft of 

 the mafs was in powder, and uniform. From 

 this experiment, therefore, unlefs I am deceiv- 

 ed, it may be concluded, that arfenic and CON 

 rofive fublimate, in the proportions I have di- 

 rected, can be united by fublimation, and con- 

 nected in the greateft part into a folid mafs. 



Du Mon flier ", Doffie, and many others af. 

 firm, that the prefence of arfenic is indicated 

 in the black colour produced by pouring an al- 

 kaline lixivium into a folution of corroilve fub- 

 limate* But Barchufen f, and Boulduc, fenior f, 

 have long aflertcd, thrt xhis experiment is fal- 

 lacious and ill-founded. Gnieliu contends, that 

 a folution of corroilve fublimate adulterated 

 with arfenic yields, on the addition of the vo-. 

 latile alkali, a black precipitate. To me, how- 

 ever, when making this triul, the event did not 

 fcem to anfwcr my expectation. For in thof< 

 particles which were abfolutely under the form 

 of arfenic and cor rofivc fublimutc, no change of 

 colour was produced by the fpirit of fal ammo- 

 niac prepared with quicklime. The remaining 



iohd 



* Inannotat. ad Chcmiam Glaferi Si Le Ftfvre. 



f Pyrofophia, 1698. 



t Mem. del 1 Acad. dcsSc. a. 1699. 



