But good flour and good yeast being supposed, with a temperature favorable to the development of fermentation, the whole success of the process depends on the thorough diffusion of the proper proportion of yeast through the whole mass, and on stopping the subsequent fermentation at the precise and fortunate point. The true housewife makes her bread the sovereign of her kitchen,--its behests must be attended to in all critical points and moments, no matter what else be postponed. She who attends to her bread when she has done this, and arranged that, and performed the other, very often finds that the forces of nature will not wait for her. The snowy mass, perfectly mixed, kneaded with care and strength, rises in its beautiful perfection till the moment comes for fixing the air-cells by baking. A few minutes now, and the acetous fermentation will begin, and the whole result be spoiled. Many bread-makers pass in utter carelessness over this sacred and mysterious boundary. Their oven has cake in it, or they are skimming jelly, or attending to some other of the so-called higher branches of cookery, while the bread is quickly passing into the acetous stage. At last, when they are ready to attend to it, they find that it has been going its own way,--it is so sour that the pungent smell is plainly perceptible. Now the saleratus-bottle is handed down, and a quantity of the dissolved alkali mixed with the paste,--an expedient sometimes making itself too manifest by greenish streaks or small acrid spots in the bread. As the result, we have a beautiful article spoiled,--bread without sweetness, if not absolutely sour. In the view of many, lightness is the only property required in this article. The delicate, refined sweetness which exists in carefully kneaded bread, baked just before it passes to the extreme point of fermentation, is something of which they have no conception; and thus they will even regard this process of spoiling the paste by the acetous fermentation, and then rectifying that acid by effervescence with an alkali, as something positively meritorious. How else can they value and relish baker's loaves, such as some are, drugged with ammonia and other disagreeable things, light indeed, so light that they seem to have neither weight nor substance, but with no more sweetness or taste than so much white cotton? Some persons prepare bread for the oven by simply mixing it in the mass, without kneading, pouring it into pans, and suffering it to rise there. The air-cells in bread thus prepared are coarse and uneven; the bread is as inferior in delicacy and nicety to that which is well kneaded as a raw Irish servant to a perfectly educated and refined lady. The process of kneading seems to impart an evenness to the minute air-cells, a fineness of texture, and a tenderness and pliability to the whole substance, that can be gained in no other way.