of Grains and Farinaceous Substances. 225 



2d, The same ground and germinated barley, but de- 

 prived of its bran by bolting, was treated in the same, man- 

 ner as in the first experiment; it fermented with the same 

 appearances, and yielded an equal part or' carbonic acid gas 

 and hydrogen gas. Thus the bran was not the source of the 

 latter gas, as at first supposed. 



3d, Brewers' mash, exposed in the same apparatus to the 

 same temperature of 22 degrees, fermented more quickly 

 with a more rapid effervescence, and its gas was merely car- 

 bonic acid, without hydrogen gas. Thus the latter depends 

 upon the farina mixed with flour. 



4th, The farina of germinated barley, with water, exposed 

 in the matrass to a temperature of 15° "(59° of F.) did not fer- 

 ment until the end of five hours; and its gas was condensed 

 by potash. Upon raising the temperature to 22 degrees, 

 there came off a mixture of gas not soluble and inflamma- 

 ble, the proportion of which was soon equal to that of the 

 carbonic acid. Thus it is necessary that there should be a 

 heat of upwards of 20° (68° of F.) before there can be any 

 liberation of hydrogen gas in the farina of barley which is 

 fermenting. 



5th, Six pounds of ground barley, not germinated, treated 

 at three several times with twelve pounds of warm alcohol, 

 furnished one ounce two drachms of pure sugar; while six 

 pounds of germinated barley, treated in the same manner, 

 yielded four ounces and two drachms, or about 5 per cent; 

 which is four times what the barley contained previous to 

 germination. Thus, germination forms sugar, as we have 

 announced. 



Cth, We put 24 pounds of farina of barley, not germi- 

 nated, into a tub with seven times its weight of hot water at 

 70° ( 158° of F.) and four pounds of mild beer yeast. Fermen- 

 tation immediately commenced with great violence, and con- 

 tinued seven days. The liquor submitted to distillation, with 

 the husks, yielded nine litres of a weak and empyreunuffic 

 liquid, which, being passed again through the still, furnished 

 Ifi decilitres of an alcohol at 16 degrees, which comes to 

 nine decilitres at 40 degrees. These nine decilitres, weigh- 



Vol. 25. No. 99. Aug. 1 SOG. P i»g 



