pn. BostocK ON Goulard's extract. 75 



ir. 



^:i:p€riments on the Anah/fis of Goulard's ExtraB, or the Aqm 

 Lithar:ryri acelaii. % John Bo stock, M. D. Coinmiu 

 nicated by the Author. 



To Mr. NICHOLSON". 

 Dear Sir. 



1 HAVE the pleafure to tranfmit to you forae experiment."? 

 on (he analyfis of Goulard's extra6}, which I hope you may 

 think not unworthy of a place in your Journal. 

 I am. Sir, 



Your obedient Servant, 

 Liverpool, JOHN BOSTOCK. 



May 5» 1805. 



During the courfe of fome experiments on the analyfis of The extraft of 

 animal fluids, I was led to obierve the efFeCt ot the acjua /?- i^^es muciiage 

 thargyri acetati, or the extract of Goulard, as a coagulator more than the 

 of mucus, and particularly to notice the fuperiority of its power *"^^'^ ° ^ 

 over that of the acetate of lead. From thefe circumftances I 

 was induced to examine into the opinions that had been enter- 

 tained rerpe<5ling its compofition, but was not able to obtain 

 any fatisfadtory information. Although it is a compound fo 

 well known, and fo frequently employed, it appears never to 

 have been made the fubjed of chemical analyfis. In Dr. it has not bwm 

 Thomfom^s Syftem of Chemiftry it is not diftinguilhed from examined. 

 the common acetate of lead ; * Dr. Murray informs us, that 

 «' it is merely a folution of acetate of lead in water, with an 

 " excefs of acid; f and Dr. Duncan, Jun. conceives, that 

 it does not diflfer from a iolution of the acetate of lead of the 

 iame flrenglh. j We meet with nothing fpecific refpe6ting its 

 conflitution in M. Fourcroy's " Syjieme", § nor is there any 

 light thrown upon it by his acute commentator Prouft. jj In 

 this dearth of information, I proceeded to make the following 

 experiments. 



-^Chcm. III. 52. t Mat. Med. II. 223. X Edin. Difp. p. 506 

 § VHI. 203. Journ. Phyf. LVI. 207, 



To 



