■r^ UK. B(>STOCK ON GOULARD*S EXTRACT. 



Experiments on i . To 200 grains of diftilled water were added 60 trains of 



its compohtion, ^ . ., , , . . r , ^ ... « . ^ . . • 



The common acetate ot lead, m its ufual cryftalline ftate; the fluid was kept 



acetate of lead for about an hour at the boih'ng temperature, and was afier- 

 watw! °'^ ^" vvards filtered. The refidue, when dried, did not amount to 

 more than 2 grains; this was boiled in a fredi quantity of water, 

 -when about half of it was diffolved, but one grain ftill re- 

 mained not a£led upon by the water. It appeared, therefore, 

 that a faturated folution of the acetate of lead was formed; it 

 was tranfparent and colourlefs; it ilightly reddened paper 

 ilained with litmus. 

 This was pre- ^' A foUition of the carbonate of polaUi was prepared, in the 

 cipitAtedby car- proportion of 11.25 grains of potafti to 100 grains of water. 

 It TlwetWvtn ' "^^ ^^ grains of the folution of the acetate of lead from No. I , 

 parts caibonate a quantity of this folution of polalh was gradually addetl; a 

 ^ ^ ' copious precipitate of the carbonate of lead was produced ; 



after the addition of 60 grains of the alcaline folution there 

 was no farther precipitation, and the fluid fllghtly afFe(5led a 

 paper foaked in the infufion of the mallow flower. The pre- 

 cipitate was cariefully cplk^ed, and being dried by a geiitle 

 heat, aiTorded eight grains of carbonate of lead. 

 Goulard's cx- 3. Forty grains of aqna liihargyri acetuti were treated in 



tra4J gaye eleven the fame noanner with the carbonate of potafli; the precipitate 



■pans carbonate r , j • .i ' .i r • 



of lead. rormed appeared more copious than in the iorraer experiment, 



and after the addition of 40 grains only of the alkali, no farther 

 effefi feeraed to be produced; the fluid affected the mallow-i 

 paper in the fame degree as in the former experiment. The 

 precipitate, being colieded and dried, weighed 1 1 grains. 

 It.did not red- ^' The aqua litharguri acetatl did not in any degree redden 

 den liti'nus paper, litmas paper; a few drops of it were added to half an ounce 

 with ikm Js in- ^^ ^^^ infufion of litmus ; a precipitate of a beautiful light 

 fuilon. blue was immediately formed, while the fluid was left tranf- 



parent and nearly colourlefs. 

 The folution of ^' Twenty grains of the folution of acetate of lead, No. 1, 

 acetate give 4 g!-. were flowly evaporated; the fiuid became extremely vifcid, 

 duc'b tvl'.""^*' ^"^ ^*- length, in fome degree, brittle and tranfparent, and af- 

 fumed the appearance of dried gum. It weighed about four 

 grains. 

 Aqualith. acct. ^- Twenty grains of the aqua litharguri acetati were eva- 

 pAve 5 gr. white porated in the fame manner; it became white and opake, and 

 •opa erci ue. yj^\^^^ jj^^ procefs w^as completed, it exhibited the appearance 

 of a number of fcales of a pe^rfcolour. It weighed a little 

 ijiore than five grains. 



7. A 



