t 337 J 



Experiments, 



** I. A fteel pin put into the cydcr-winc became 

 of a brown colour, which left on the tongue the 

 ilaufeous aftringent tafte o( coppery at the fame time 

 the wine became of a darker colour, from fome 

 portion of iron diflblved in it. 



*' 2. Sal volatile mixed with the cyder-wine 

 made it of a dark turbid colour; it occafioned in 

 white-wine a kind of cloud fimilar to that fome- 

 times obfervcd in urine. 



" 3. Phlogifticated alkali precipitated a dark 

 brown cloud very copioufly; it had no effe^b on 

 common white- wine ; a clear proof of the prefence 

 of copper in the cyder-wine. 



" 4. A fteel pin put into cyder- wine in which a 

 precipitation had been made by fal volatile, was 

 not at all incrufted, nor was its colour in the leaft 

 changed, though it remained in the wine more 

 than twelve hours.'* 



Thus far my correfpondent. . 



OBSERVATIONS. 



Though a fingle grain of copper diflblved in 



upwards of twenty gaUons of clear water may be 



Vol. V. Z detcdcd 



