)dcid' of Rid Lead Orec-ifivj Earth cf Berjh. 393; 



tsffe ; it is decompofed by the mineral acids i it gives out oxygen gas by heat, and thcrC'* 

 fiiiue is an earthy mafs of a green colour. . 



Comhination of the Acid of Red Lead -with Lime. 



LiM E combines with the acid of red lead, and affords a fait which does not appear to .-. 

 be more foluble than the foregoing : for, by mixing lime-water with a folution of this add,.,. 

 a»depofition of an orange-yellow colour is made, which.is lefs abundant than, with barytes J . 

 a.conlequence which naturally follows, from, the barytes bdng about twenty times more 

 foluble in cold water than lime ; in confequence of which the precipitate formed with this . 

 lad earth muft be twenty times lefs in quantity. A large quantity of fait, of the fame co- 

 l^wr as the. former, is alfo obtained by evaporation of the fluid. The fait farmed by the. 

 combination of lime and the acid of red lead does not appear to differ from that of barytes, 

 except in its being lefs foluble, and poffclling different alEnities and proportions of compa- - 

 nent parts. 



Its habitudes with acids, and with heat, are the fame asthofe of the. combination of ba-< 

 rytes with the fame. acid. . 



(To be concluded in our next.) 



. ni. 



Information refpeBing the Earth of the Beryl .- in Continuation of the firji Memoir on the fame • 



Subject. By Citizen Vau^ELIN*, 



A HAVE announced in my Memoir on the Earth oFthc Beryl, that this foflil contains--, 

 about 8 per cent, of that principle ; but at the fame time I obferved, that I did not confider • 

 this proportion as being very accurate, becaufe I prefumed that a certain quantity had been, 

 diflblved by the potalh employed to feparate the alumine. . ' 



I alfo announced that I had begun fome trials, to afcertain whether the alumine contained 1 

 in the beryl was in fa£l contaminated by a mixture of this new earth.. The refult of thefe 

 experiments, related in a few words, will form. the fubje£l of the prefent communication; 

 to the Inftitute, together with an account of certain properties of this fubllance, of which I > 

 have fince extrafted a larger quantity. , , 



Experiment I. I put together the alumine which had been obtaitied from three dtjcimaftic? 

 quintals of beryl, which had beenanalyfcd in the fame number of feparate operations. The, 

 quantity was 63 gramme?. I diffolved them in fulphuric acid, and, after having (brevetel. 

 the folution, I fubmitted it to evaporation to obtain the alum. The evaporation, was., 

 continued until cryft^ls were UQ longer affordedj The remaining mother water, was .very ■• 

 faccharine. and thick. . , " 



Experiment 2. I mixed this mother water with a folution of carbonate of ammoniac mor£.- 

 tVn fufficient to faturate the acid. The mixture was repeatedly (halcen during twenty-four 

 hours. I perceived that the bulk of the precipitate thrown down by the firft po.rtions pf the ■ 



• Tlie firft Memoir is inferted in the prefent volume of our Journal, page 35.8,., TJ{U .coptifluatjon is tranf-> 

 latjd fi^Q"* '^'^s Annales de Chiwie, xxvi. 1 70, ,„ >; * 



^'1 ■ - ■ • -^ua t *>«fi *•■• ., ■-'•J 



1! • carbonate' 



