[ 200 ] 



He found P.380 grains cryftallized foda to contain 04 of mere 

 cauftic alkali, then 100 fhonld contain 21,17 of alkali, which dif- 

 fers from my refulf by lefs than ^ a grain. Hence 21,17 grains of 

 mere foda are equivalent to 100 grains of the cryftallized. 



Again, he found that 2380 grains of cryflallized foda lofe by 

 thorough deficcation 1523 grains, and confequently are reduced to 

 857 grains, therefore 100 grains of the cryftallized are reduced to, 

 and are equivalent, as to real alkaline contents, to 36 grains, lofing 

 therefore 64 grains of mere water. 



And, laftly, he found that 857 grains of deficcated foda contain 

 514 of mere cauftic foda, and confequently 100 grains of the de- 

 ficcated contain nearly 60 of mere foda, and confequently 40 of 

 fixed air. All thcfe refults agree almoft exadly with mine. 



Experiment id. i Klaproth^ 333. 



In his experiment 1000 grains of dry cryftallized foda loft when 

 thoroughly deficcated in a fand-heat, 637 grains of water, confe- 

 quently 100 fliould lofe 63,7, which fcarcely differs from Dr. 

 Black's refult, then the dry refiduum amounts to 2)^^'r> grains. 



Of 



