The food may also be deficient in nutriment. The effects of insufficient food are too well known to need much description: debility includes them all; it invades every function of the animal economy. And as life is the sum of the powers that resist disease, if disease is only the instrument of death, it follows, of course, that whatever enfeebles life, or, in other words, produces debility, must predispose to disease. Many cattle, during the winter, live on bad hay, which does not appear to contain any of that saccharine and mucilaginous matter which is found in good hay. When the spring comes, they are turned out to grass, and thus regain their flesh. Many, however, die in consequence of the sudden change. It has been satisfactorily proved that fat cattle, of the best quality, may be produced by feeding them on boiled food. Dr. Whitlaw says, "On one occasion, a number of cows were selected from a large stock, for the express purpose of making the trial: they were such as appeared to be of the best kind, and those that gave the richest milk. In order to ascertain what particular food would produce the best milk, different species of grass and clover were tried separately, and the quality and flavor of the butter were found to vary very much. But what was of the most importance, many of the grasses were found to be coated with silecia, or decomposed sand, too hard and insoluble for the stomachs of cattle. In consequence of this, the grass was cut and well steamed, and it was found to be readily digested; and the butter, that was made from the milk, much firmer, better flavored, and would keep longer without salt than any other kind. Another circumstance that attended the experiment was that, in all the various grasses and grain that were intended by our Creator as food for man or beast, the various oils that enter into their composition were so powerfully assimilated or combined with the other properties of the farinaceous plants, that the oil partook of the character of essential oil, and was not so easily evaporated as that of poisonous vegetables; and experience has proved that the same quantity of grass, steamed and given to the cattle, will produce more butter than when given in its dry state. This fact being established from numerous experiments, then there must be a great saving and superiority in this mode of feeding. The meat of such cattle is more wholesome, tender, and better flavored than when fed in the ordinary way." (For process of steaming, see Dadd's work on the Horse, p. 67.)