:new vegetable substance. Q"J 



the a&ion of an acid on calcareous foils. F. Reprefenls the 

 bottle for containing the foil. K. The bottle containing the 

 acid furnifhed with a ftopcock. G. The tube connected with 

 a flaccid bladder. I. The graduated meafure. H. The bottle 

 for containing the bladder. When this inftrument is ufed, a 

 given quantity of foil is introduced into F; K is filled with 

 muriatic acid diluted with an equal quantity of water; and 

 the (lop-cock being clofed is connected with the upper orifice 

 of F, whieh is ground to receive it. The tube G is introduc- 

 ed into the lower orifice of F, and the bladder connected with 

 it placed in its flaccid ftate into H, which is filled with water. 

 The graduated meafure is placed under the tube of H. When 

 the flop-cock of K is turned, the acid flows into F, and ads 

 upon the foil; the elaftic fluid generated partes through G 

 into the bladder, and difplaces a quantity of water in H equal 

 to it in bulk, and this water flows through the tube into the 

 graduated meafure ; the water in which gives by its volume 

 ihe indication of the proportion of carbonic acid difengaged 

 from the foil ; for every ounce meafure of which two grains of 

 carbonate of lime may be eftimated. ^ 



L. Reprefents the ftand for the lamp. 



M, N, O, P, Q, R, S. Reprefent the bottles containing the 

 different reagents. 



IV. 



Difcovery of a new Vegetable Subjlance, by Mr. Rose *. 



A CONCENTRATED decoaion of the root of elecam- Decoflion of 

 pane, inula hcleniwn, after flanding fome hours, depofits a elecampane root 



i • • r i t> depofits a pow- 



white powder, appearing at fit It fight much like narch,,* but d er refembling 



differing from it both in its principles and in its manner of flarch * 



comporting itfelf with other fubftances. 



1. This fubflance is generally infoluble in cold water, it is infolubleia 

 Being triturated with it a white milky liquor is formed, which cold water « 

 foon depofits a heavy white powder, and leaves the fuper- 

 natant water clear and limpid. 



2. It diflblves very well in boiling water. On heating to Soluble ?n boii- 

 ebullition one part of the white powder, with four parts of ,n§ Writeu 



* From Gehlen's Journal for 1804, Vol, IILp. 217. 

 Vol. XII. — Octqbeu. \ H water, 



