276 AIR. 



Q. Why does YEAST make BREAD LIGHT ? 



A. Flour contains a small portion of 

 saccharine matter (or sugar) ; and the 

 yeast (mixing with this) produces fer- 

 mentation, as it does in brewing. 



Q. How does FERMENTATION make the 



DOUGH RISE ? 



A. During fermentation, carbonic 

 acid gas is evolved; but the sticky 

 texture of the dough will not allow it to 

 escape, so it forces up little bladders all 

 over the dough. 



Q. Why is DOUGH placed BEFORE the FIRE ? 



A. 1st Because the heat of the fire 

 increases the fermentation : and 



2ndly It expands the gas which is 

 confined in the little bladders ; in con- 

 sequence of which, the bladders are blown 

 up larger, and the dough becomes lighter 

 and more porous. 



Q. Why is BREAD HEAVY, if the dough be 

 removed from the fire ? 



A. Because the dough gets cold, and 

 then the air in the bladders condenses, 

 the paste falls, and the bread is close 

 and heavy. 



