|g ANALYSIS OF CORUNDUM, AND Of 



Barytes water, Exp. 6. No precipitate took place from a mixture ofba- 

 water r =:no"prc- r ^ tes " wrateran ^ ftrontia-water ; nor from folutions of the car- 

 cipitatc. Donates of thofe earths, in water impregnated with carbonic 



acid. 

 Mur. lime and Exp. 7. Guyton obtained a precipitate, by mixing folutions 

 ~ "preelp?— 3 °f muriate °f ame ar, d muriate of alumina. I could not obtain 

 Failed. any. 



Mur. lime and £ X p t 8. Solutions of muriate of lime and muriate of mag- 

 •= ^ no ^ precip , . a, ne li a » when mixed, did not afford a precipitate. 

 Mur. lime and Exp. 9. Muriate of barytes did not, as Guyton has aflerted, 

 "Jeci* —Failed" ^ orm a precipitate with muriate of lime. He was right in 

 faying, that muriate of ftrontia gave no precipitate with mu- 

 riate of lime. 

 Mur. mag. and Exp. 10. Muriate of magnefia and of alumina, afforded me 

 mur. alum, ~ no precipitate. Guyton fays, that the liquors became milky. 

 Mu^magnefia &*&• * * • Muriate of magnefia, whether mixed with muriate 

 and mur. of ba- of barytes or of ftrontia, afforded me no change; although 

 — "bunda™" '* Guyton fays he obtained an abundant precipitate, by mixing 

 precip.— Failed, muriate of magnefia with muriate of barytes. 

 Mur. alum, and Exp. 12. Muriate of alumina and of barytes, did not, when 

 mur. barytes ~ mixed together, yield any precipitate. Guyton afferts, that 

 precip.—Failed. .. . 6 • •* * • *i • r 



K there is a precipitate in thiscale. 



Mur. barytes Exp. 13. Muriate of barytes and of ftrontia, did not form a 



and ftrontia = precipitate. Guyton has remarked the fame. 

 Mur^ftrontia Exp. 14< - From muriate of ftrontia and of alumina, 1 ob- 

 and alumina zz tained no precipitate. With Guyton the liquor became 

 no precip. ^ ^ 



Guyton was From all thefe experiments it appears very clearly, that 



wrong in aflert-. Guyton has pronounced too haftily, upon the affinity which he 



has affinit" for* ^ u PP°^ es barytes to entertain for lime, for magnefia, and for 



lime, magnefia alumina ; and that he is equally in the wrong, with regard to 



and alumina j the a ffi n j ty f ft ron tia and alumina. With regard to Exp. 3, 4, 

 and that ftrontia ■ f , ° . r . 



attracts alumina, and 5, although they appear to be true, yet it would require 



the refpe&ive precipitates to be further examined, before we 

 admit a decided affinity between the earths. The quantity of 

 carbonic acid alfo, which muft of courfe combine with the 

 potafh, during the treatment of the filica by that alkali, (hould 

 De taken into account, in confidering the caufe of the preci- 

 pitate. 



The 



