One of the most essential points in determining the quality of a cheese is the amount of moisture it contains. A proper retention of moisture by the product in a cured state depends primarily on the rennet that separated it from the watery serum of milk, and secondly on the amount of heat applied in cooking, and the quantity of salt afterwards added. To adjust all these little niceties to a minimum of fine, even quality of which moisture is an adjunct, requires experience and long familiarity with the handling and treatment of milk. Butter, moisture and caseine should exist in about equal parts to make a mellow cheese, and, to fix the proportion rightly, enough rennet should be incorporated into the milk to expel all excess of moisture, and yet leave enough to withstand the effect of a heat judiciously gauged to cook it. Thus, rennet influences moisture on the start, and other forces afterward are introduced that either aid or retard it. When rennet diffuses itself through milk its power and potency are largely measured by the temperature of the fluid body surrounding it. As cheese making is merely an imitation of nature’s workings in curdling milk in a calf’s stomach, the nearer we can follow that process on the start, the closer to perfection we get. Long experience has demonstrated that a temperature between 80° and 85° Fahrenheit is the best degree of warmth for milk to have attained when it receives the peptic fluid. A temperature above that expels the butter globules into the whey, and below, the active principle of rennet is not brought out and tardily and incompletely coagulates the mild solids. By afterward applying the lowest degree of heat that will cook it within a reasonable time to a consistency of contraction and expansion, the moisture still remains in proper proportion. A few degrees of excess heat will produce a dry, hard curd, and a future dry, hard cheese. Judgment, discretion, and experience are necessary in applying salt to retain moisture. Salt itself is, of course, a moisture retainer, but a too heavy application hardens and stiffens the cheese structure and retards the curing of the product. Never salt more than enough to give and retain flavor and preserve quality. If the points we have given above have all been observed, then the proper proportion of moisture in cheese will be assured.