[ ^(^3 ] 



3d. He alfo found that 22,5 grains of cryftallized acicular 

 tnuriated lead, well drained and dried by expofure to the air, 

 contained 16 grains of metallic lead, therefore 100 grains of fuch 

 cryftals fhould afford 71,11 of metallic lead. 



First, to thefe fads I muft farther add, that in muriated lead, 

 whether cryftallized or deficcated, the lead is in a calcined ftate. 



Hence I infer, that lince loo grains of metallic lead give 133 

 of calx of lead, the 71,11 grains of metallic lead in 100 parts 

 cryftallized muriated lead amount to 81,77 of calx of lead. The 

 calx, including not only the metallic lead, but alfo oxygen and 

 water, as we ftiall prefently fee ; the remainder therefore is real 

 marine acid, amounting to 18,23 grains. 



Again, as 133 grains of the thoroughly deficcated mviriated 

 lead contain 100 of metallic lead, 100 grains of this muriated 

 lead muft contain 75,12, but 75,12 metallic lead form 83 of 

 calx ; the remainder therefore muft be real marine acid = 17 

 grains. 



These conclufions are farther confirmed by the experiment of 

 Mr. Wolfe. Phil. Tranf. and 10 Roz. 370. Having decom- 

 pofed 1 20 grains of muriated lead dried by expofure to the air 

 by a fufficient quantity of tartarin, he foimd them to produce 61 

 grains of muriated tartarin. Therefore both the 120 grains mu- 

 riated 



