from, decisive. 



C£2 ON DESTROYING THE ELASTICITY Of CO&R. 



some precipitate to the contrary substance, the fluid which, 

 had been saturated with jelly will be precipitated by oxi- 

 muriate of tin, and the fluid which had been saturated 

 but this far with the oximuriate of tin will be precipitated by jelly. Yet 

 when we consider the compound nature of the fluid upon 

 which we operate, and the variety of actions which may 

 take place between the different reagents, we are not au- 

 thorized even from this experiment to draw a decided infer- 

 ence in favour of the existence of two distinct substances. 

 In entertaining- doubts respecting- the existence of extract 

 as a distinct principle of vegetables, I feci happy to have 

 my opinion supported by that of Mr. Murray *. 



(To be concluded in our next.) 



X. 



Question on the Preparation of Cork for Modelling. In d 

 Letter from a Correspondent. 



To Mr. NICHOLSON. 

 SIR, 



How may the JL Should be obliged to you, or any of your correspon- 



ela^ticuy of dents, if they could inform me of the method of destroying 

 toik be de- . , . , 



stnjed? elasticity m cork ; or what process it undergoes, to render 



it fit for modelling. If you recollect its having been no- 

 ticed in your Journal, by mentioning the volume you wilL 

 equally oblige, 



Yours, &c. 



R. Z. A. 



Elasticity of I am not acquainted with the method of depriving cork 



cork owing to f j? elasticity, but do not think my correspondent will find 

 it; texture, - ' J . l 



much difficulty in discovering it by experiment. — trorn the 



texture of cork as seen under the microscope, it appears to 



* Chemistry, IV, 260. 



be 



