82 CHEMICAL ANALYSIS OF SOME CALAMINES, 



By the refults of the analyfis of the Mend;, --Hill calamine, 

 corroded by the theory, carbonate of zinc appears to confiit of, 

 Carbonic acid - - - - » 

 Calx of zinc - - - - 1. 



Dedu6ling from the calx of zinc in the Bleyberg calamine, 

 that portion which correfponds, on thefe principles, to its 

 yield of carbonic acid, the remaining quantity of calx of zinc 

 and water are in fuch proportions as to lead, from the theory, 

 to confider hydrate of zinc as compofed of 



Calx of zinc - - - > i. 



4- 



Water, or rather ice - _ , i 



And, from fhele refults, corre6ted by the theory, I confider 

 Bleyberg calamine as confifting of. 



Carbonic of zinc ^ ~ . 2. 



Hydrate of zinc - _ . 2. 



The teft of thishypothefis is in the quantities of the remote 

 elements which analyfis would obtain from a calamine thus 

 compofed. 



The following table will Hiow how very infignificantly the 

 calamine compounded by the theory, would differ iu this re- 

 fpect from the calamine of nature. 

 Ei.indatmns of 1000 parts of the compound fait of carbonate and bvdrale 

 :hcmicaltheory. o|-^i„^^onfirtof, 



("Carbonic ^qq 



Carbonateof zinc I acid =: =: 



400 - - - - = J ^ 



/ Calx of 



400 X 2 

 (_ zmc = ^ =266] 



Jlydrate of zinc 

 ~ 600 - - - - 



Calx of 600x3 



zmc =- 



4 



;450 _ 



T 600 

 w Ice - - = — — - ~ 130 



1000, 



Great as is the agreement between the quantities of the laft 

 column and thofe obtained by the analyfis of the Bleyberg ca- 

 lamine, it would be yet more perfed, probably, had there 

 been, in this infiance, no fources of fallacy but thofe attached 

 to chemical operations, fuch as errors of weighing, wafte, &c. 



but- 

 3 



