Bread have a special taste or texture. At one time, all yeast-leavened breads were sourdoughs. Recently there has been a revival of sourdough bread in artisan bakeries. Traditionally, peasant families throughout Europe baked on a fixed schedule, perhaps once a week. The starter was saved from the previous week's dough. The starter was mixed with the new ingredients, the dough was left to rise, and then a piece of it was saved (to be the starter for next week's bread). The rapid expansion of steam produced during baking leavens the bread, which is as simple as it is unpredictable. Steam-leavening is
Substance theory inverse relation is participation. Thus in the example above, just as red inheres in the apple, so the apple participates in red. Two common arguments supporting substance theory are the argument from grammar and the argument from conception. The argument from grammar uses traditional grammar to support substance theory. For example, the sentence "Snow is white" contains a grammatical subject "snow" and the predicate "is white", thereby asserting "snow is white". The argument holds that it makes no grammatical sense to speak of "whiteness" disembodied, without asserting that snow or something else "is" white. Meaningful assertions are formed by virtue