VENT PEG. 273 



Q. Why does a small piece of raw MEAT, or a 

 few RAISINS improve FLAT BEER ? 



A. 1st Because they supply it with 

 nitrogen to form it into al'cohol. 



2ndly As the raw meat, &c. putrifies, 

 it gives off carbonic acid gas into the 

 heer, which gives it "life." 



Q. Why is BEER FLAT, if the cask be open 

 too long P 



A. Because too much of the carbonic 

 acid gas (produced by fermentation) is 

 suffered to escape. 



Q. How is the CARBONIC ACID GAS of BEER 

 generated P 



A. The saccharine (or sugar) of the 

 malt is converted by fermentation into 

 carbonic acid gas and alcohol. 



Q. Why does BEER turn FLAT, if the VENT 

 PEG be left OUT of the tub ? 



A. Because the carbonic acid gas 

 escapes through the vent hole. 



Q. Why will NOT beer RUN OUT of the tub, 

 till the VENT PEG is taken out ? 



A. When the tap is turned, air 

 rushes through the tap into the bottom of 

 the tub, and holds the liquor in. 



The upward pressure of air is illustrated by the 



