Quotation from: General Science

Written by: Bertha M. Clark


Stray yeast finds a favorable soil for growth in the warmth and
moisture of a batter; but although the number of these stray plants is
very large, it is insufficient to cause rapid fermentation, and if we
depended upon wild yeast for bread raising, the result would not be to
our liking.


When our remote ancestors saved a pinch of dough as leaven for the
next baking, they were actually cultivating yeast, although they did
not know it. The reserved portion served as a favorable breeding place
to the yeast plants within it; they grew and reproduced amazingly, and
became so numerous, that the small mass of old dough in which they
were gathered served to leaven the entire batch at the next baking.

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