PHYSICAL AND LITERARY. 533 



fully and quickly in aqua fortis diluted 

 ■with fix times its weight of water. The 

 folution of lead in fpirit of vin^?gar, be- 

 ing evaporated flo ly to a due confid- 

 ence, and then removed to a cool place, 

 iiever {hoots into fair dilHn(5l chryftals ; 

 but thickens, as it were, into a faline 

 mafs, like coarfe fugar, fomewhat moift ; 

 and, with difficulty, can be brought to 

 a tolerable whitenefs : But the folution 

 in diluted aqua fortis^ treated in the 

 fame manner, gives large, folid, fhining, 

 ivhite chryftals, regularly fhaped. The 

 calx of lead or minium will likewifedifToIve 

 by digefting or boiling in oil of olives or 

 lintleed ; but, as it dilTolves, it thickens 

 into the confiftene-e of an unguent or 



plailter. ji-^iauyiyjU .' -.,!'> 



Good aqua fortis or fpiritvs nitr^ will 

 diffolve about an equal weight of quick- 

 filver ; and the folution is performed with 

 a great commotion, heat, and thick red 

 fmoke : Strong oil of vitriol diflolves 

 fcarce a third part of its weight of quick- 

 iSlver J and the folution is made in a flow 



and.: 



