[ 33^ ] 



\ Into the firft was dropped fome volatile alcali; 

 into the fecond fhlogijlicated alkali; and into the 

 third the wine teji. 



Slight marks of precipitation were barely per- 

 ceptible in all the glafles, but the dark turbid ap- 

 pearance of the mixture concealed the changes of 

 colour, as it did in fome meafure in two of the 

 preceding experiments, fo as to render the refult 

 rather equivocal, though they were repeated more 

 than once. 



Being curious to know whether the fame phceno- 

 mena would ftrike other obfervers in a fimilar way, 

 I fcnt a bottle of the cyder-wine to my ingenious 

 friend Dr. Johnftone of Worcefler, for his examina* 

 tion. His fon foon after favoured me with the 

 following letter, containing the refult of his expe- 

 riments, which I have the fatisfa6lion to find agree 

 very nearly with my own. 



" Sir, JVorceJleVy Sept, 23, .. 



*^ I am defired by my father to acquaint you 



with the refuk of fome experiments which I have 



made on the cyder-wine. By them it appears to 



t>e canfiderably impregnated with copper, 



" I have the honour to be. Sir, 



*' Your obedient humble fervant, 



" JOHN JOHNSTONE." 



