Some chemists persuade themselves that the fermentation of the flour dough differs materially from the fermentation of saccharine substances; namely, that the vinous, acetous, and putrefactive stages of the fermenting process take place simultaneously in the dough. They imagine the vinous fermentation to take place in the saccharine mucilage, the acetous in the starch, and the putrefactive in the gluten at the same time, and from the modification of each by the others, they consider that peculiar action to originate which converts paste into bread. Against this opinion, however, the following objections may be urged. In the first place, the quantity of saccharine mucilage is so extremely small as to produce no sensible effect alone on the whole mass, and what little there is probably passes speedily into the acetous fermentation. Secondly, the temperature that is required for bread-making is considerably lower than that at which starch dissolves in water, and where this is the case no alteration will take place, even in a long course of time: this is clearly shown by the usual process of starch-making, in which the bruised wheat is fermented for several days in large vats, in order to destroy the gluten, after which the starch is procured by simple deposition from the washings of the residue; and thirdly, no vestige whatever of the products evolved during the putrefactive fermentation of gluten, can be traced in any stage of the panification of bread flour. ------------------------------------------------------------------------ Unleavened Bread. Bread prepared by baking from the meal of farinaceous seeds kneaded with water into a dough and baked, is divided into three sorts, namely;—1. Unleavened bread; 2. Leavened bread; and, 3. Bread made with yeast. Unleavened bread contains all the component parts of the flour but little altered. The meal is simply mixed with water, and baked into cakes. It is heavy, dry, friable, and not porous. The oatmeal bread of Scotland, is unleavened bread; as also sea biscuit, and all other kinds of biscuit. The bread that is eaten by the Jews during the passover is unleavened. The usage of which was introduced in commemoration of their hasty departure from Egypt, [Exodus, chap. 12, v. 14 to 17.] when they had not leisure to bake leavened bread, but took the dough before it was fermented and baked unleavened cakes. In Roman catholic countries it is still used, and prepared with the finest wheaten flour, moistened with water, and pressed between two plates, graven like wafer moulds, being first rubbed with wax to prevent the paste from sticking, and when dry it is used. Unleavened bread is hardly less nutritious than loaf or fermented bread, but it is generally speaking neither so wholesome nor so digestible. ------------------------------------------------------------------------ To make Oatmeal Cakes.