[ 264 ] 



rlated lead and the 6 1 grains of muriated tartarin fhould contain 

 the fame quantity of real marine acid. Now if loo grains mu- 

 riated lead dried in air contain 18,23 '"^^^ ^cid, 120 grains of it 

 fliould contain 21,87 real acid. 



And fince 100 grains muriated tartarin contain by my former 

 determination 36 grains real acid, 61 grains of this fait fhould 

 contain 21,96 ; the difference is only 0,09 of a grain. 



As to the 1 15 grains calx of lead produced in the precipitation 

 of a folution of 100 grains of lead in nitrous acid by cauftic 

 tartarin, I have already fliewn in the 2d vol. of my Mineralogy, 

 p. 497, that 100 parts lead, when diffolved in nitrous acid, take 

 up 5,8 of oxygen*, therefore the remainder is water, = 9,2 

 grains. 



Hence 100 parts metallic lead take up about 25,63 of real ma- 

 rine acid, and afford 140,62 of cryftallized muriated lead, or 

 133,12 of the deficcated. 



And 100 grains real marine acid unite to 394,06 of metallic 

 lead, and afford 548,64 of cryftallized muriated lead. 



And 



• Fourcroy, 2 An. Ciiy. 213, ftates the quantity of oxygen at }2,; in 100 of 

 muriated lead, but this is contradicted by the experiment of Mr. Wolfe, &c. He 

 moft probably means the muriated lead formed in the folution of a calciform ore. 



