i ^00 1 - 



the internal orifice of the canal, were it not fUc- 

 ccfTively difTolved by the liquor, and waflied ofF 

 in the general current, as often as the cock is un- 

 turned.* That verdigris is foluble, in very con- 

 fiderable proportion, in all thefe liquors, and there- 

 fore capable of impregnating them with the poifon 

 of copper, is clearly proved by the following expe- 

 riments: 



Grains, 



1. Half a pint of rectified Spirit of Wine digefted 

 on half an ounce of Verdigris, (240 grains) 

 diflblved 80 



2. Same quantity of Malt Spirit 90 



3. ■ French Brandy 150 



4, Water 100 



jf, __ common Wine Vinegar 225 



e. Diftilled Vinegar 23a 



7. _,— .— .«...--^-. Wine, Beer, and Cyder, 



difTolved more than Water or Spirit, but lefs 

 than either of the Vinegars. 



Should we once more revifit the (hops, laborato- 

 ries, and repofitories of drugs, we fhould find that 

 in thefe places, it requires no lefs care and attention 



• The brafs and copper cocks, now in ufe, being very unfafe, unlefs 

 kept perfecSlly clean,iwhlch is perhaps impra<flicable, ought to be wholly 

 difcarded. Might not a mixture of tin and bifmuth, a compofition 

 incapable of being aflecfled by vegetable acids, be properly fubflituted 

 in their place? or perhaps rather the improved wooden cocks, which 

 ^ould entirely prevent danger, or even fuipicion? 



to 



