68 MANTJAI, OP NATURE STUDY. 



proportion of alcohol found in it? Would it be 

 regarded as an unwholesome drink ? Why ? How 

 is whiskey made ? What is the per cent of alcohol 

 found in it? Is it a wholesome drink? How is 

 wine made ? Does it contain alcohol ? How can 

 you prove it ? Place a small quantity of wine in 

 an evolution flask, to which should be attached a 

 delivery tube, leading through a cold bath, for 

 carrying ofi" alcoholic vapor after it has been driven 

 from the flask by heat very little less than the 

 temperature of boiling water. The alcoholic vapors 

 will be condensed as it passes through the cold bath, 

 and may be received by a beaker or other vessel 

 placed under the end of the tube. Touch a lighted 

 match to the liquid gathered in that way and notice 

 the alcoholic flame; a positive proof that alcohol 

 exists in the wine. Beer may be tested in the same 

 way. Likewise cider. What is fermentation? 

 Give examples of fermentation, such as the changing 

 of apple juice into hard cider, of grape juice into 

 wine, of com juice and its distillation into whiskey, 

 etc. 



All primary fermentations produce alcohol; then, 

 why does not light bread produce alcohol ? By the 

 action of heat it escapes with the carbon dioxide. 



Put a tablespoonful of sorghum and a cake of 

 baker's yeast into a tumbler of water and set it in 



