>fEW VfcGETABLfi 3ALt, "131 



Fifty grains of the calcareous fait were heated to Incan-By ftrong heat 

 clefcence, in a retort communicating with the P^^^n^^^'co-and^carbonic^" 

 chemical mercurial apparatus^ and twelve cubic inches ofgafes,— 

 hidrogen gas mingled with carbonic gas wer^ obtained; that 

 burnt with a ftrong flame. The bulb of the neck of the re- 

 tort contained ah acid liquor, on which fwam a fluid brown an acid liquor^ 



•1 1 ,1 - .1 • . • r • I 1^ • 'T'L anda fluid brown 



Oil, both together weighmg ieven or eight grains. The re-^jj^ 



iiduum in the retort confifted of a fpongy conglobulated mafs having a fpungy 

 of a pale brown colour, interfperfed with coally Particles, ^^^^'J^'J™* j.^^ 

 and difl^olved in nitric acid with effervefcence. This.folution, and a carbona- 

 being filtered, was precipitated with carbonate of ammonia ; "°"^"**"*^* 

 when 21 grains of carbonate of lime were feparated. The 

 coally matter that remained on the filter was very light, weigh- 

 ed four grains and half, and burned on a teft, leaving a re* 

 Iiduum of a quarter of a grain of calcareous earth. 



Another portion of the calcareous fait was precipitated by By carbonate of 

 Carbonate of ammonia> and the liquid remaining was eva- f^io^g flender^^ 

 porated by a gentle heat to cryftallize it> when it furniflied a prifms wa>ob- 

 falt in long and flender prifms. tamed. 



The liquor left, after the cryftals Were feparated, vvas ex- The remaining 

 amined by feveral metallic re-agents. The folutions of filver, eiJTa'rfous'me^-' 

 mercury, copper, iron, cobalt, and uranite in nitric acid, tallie folutiens* 

 and ihofe of lead and iron in acetic acid, were powerfully 

 precipitated by it. The precipitate of copper was of the 

 colour of verdigris ; that of cobalt of a pale reddifli colour ; 

 that of uranite of a yellowifti colour; that of iron of a dull 

 brown ; and thofe of filver, mercury, and lead^ of a bright 

 brown wood colour. 



The fame liquor was rendered flightly turbid after a time ^"'^ ^^^ ^^'' 

 by the water and acetite of barytes, the muriate of tin and owing'toThe 

 gold, and the nitrate of nickel ; but thefe precipitations might sxtradive mat- 

 be the effea of the extradive matter, that adhered to the ^lYgVuy Sid! 

 acid, rather than of a combination of this with the metallic 

 •Oxides. 



I (hall proceed to the experiments I made with a view of Experiments to 

 obtaining the acid of the calcareous fa;lt pure. °^^^^*" ^^"^ ^^''^ 



Forty-five grains of the precipitate obtained from the de- The precipitate 



compofition of the calcareous fait, by the acetite of lead, ,'^'^^^^5^'^''^^ ']^, 

 . , •, r 1 ,i-i 1 • -ij-i J. . , * lead mixed with 



ware mixed with aicrupleot lulphunc aciadttuted by a drachm fuJphuricacid. 



of water. The fulphate of lead was feparated, and the liquor Decompofed by- 

 evaporated. It afforded by cryftallization thirty-four grains of " ^ 

 9^id (alt in fine needles of the colour of pale wood. 



K2 la 



