If, as is the case in some dairies, the milk be warmed in an iron pot upon the naked fire, great care must be taken that it is not singed or _fire-fanged_. A very slight inattention may cause this to be the case, and the taste of the cheese is sure to be more or less affected by it. In Cheshire, the milk is put into a large tin pail, which is plunged into a boiler of hot water, and frequently stirred till it is raised to the proper temperature. In large dairy establishments, however, the safest method is to have a pot with a double bottom, consisting of one pot within another, after the manner of a glue-pot; the space between the two being filled with water. The fire applied beneath, thus acts only upon the water, and can never, by any ordinary neglect, do injury to the milk. It is desirable in this heating, not to raise the temperature higher than is necessary, as a great heat is apt to give an oiliness to the fatty matter of the milk. The time during which the Curd stands. This is also of importance. It should be broken up as soon as the milk is fully coagulated. The longer it stands after this, the harder and tougher it will become. The quality of the Rennet. This is of much importance, not only in regard to the certainty of the coagulation, but also to the flavor of the cheese. In some parts of Cheshire, it is usual to take a piece of the dried membrane and steep it overnight with a little salt for the ensuing morning's milk. It is thus sure to be fresh and sweet, if the dried _maw_ be in good preservation. But where it is customary to steep several skins at a time, and to bottle the rennet for after-use, it is very necessary to saturate the solution completely with salt, and to season it with spices, in order that it may be preserved in a sweet and wholesome state. The quantity of Rennet added. This ought to be regulated as carefully as the temperature of the milk. Too much renders the curd tough; too little causes the loss of much time, and may permit a larger portion of the butter to separate itself from the curd. It is to be expected also, that when rennet is used in great excess, a portion of it will remain in the curd, and will naturally affect the kind and rapidity of the changes it afterwards undergoes. Thus, it is said to cause the cheese to heave or swell out from fermentation. It is probable, also, that it will affect the flavor which the cheese acquires by keeping. Thus it may be, that the agreeable or unpleasant taste of the cheeses of certain districts or dairies may be less due to the quality of the pastures or of the milk itself, than to the quantity of rennet with which it has there been customary to coagulate the milk. The way in which the Rennet is made.