The vapid taste is also corrected by the empyreuma, combined with a minute quantity of ammonia, which is soon developed on the surface of the fat, by the partial charring--not of the fat itself, but of the cellular membrane in which it is enveloped. This structure may easily be perceived on a slight examination of a piece of recent fat; all the membranous or skinny portions being only the receptacles or nests for the fat itself. And since these membranes are for the most part exceedingly thin and easily ruptured, and since heat increases the volume of the fat which they contain, the application of heat in roasting or broiling will soon make all the membranes burst which are within its influence, and thus give a free passage for the juices to unite with each other. There is, according to these statements, but little loss of the substance of meat when roasted or broiled, and the chemical changes produced are so slight, that nearly all its nutritive elements must be preserved and concentrated in the cooked meat. When there is a watery medium used, through which heat is applied to animal food, as for example, in the process of stewing or boiling, a portion of the fat, gelatine, and osmazome, is dissolved, and mixes with the water. Nutritive matter is consequently lost, or, at least, it is transferred from the meat to the broth or soup. In the operation of _stewing_ there is less of this transfer made; and, besides, as the medium is scarcely kept at a boiling heat, less of the nutritive juices are dissolved. When, however, the broth or gravy in which meat is _boiled_ is made use of, as well as the meat itself, boiling is the most economical practice; for though nothing be added except the water, this itself, if it contains no nourishment, at least fills the stomach, and serves to diffuse more widely the nutritive juices of the meat which it holds in solution or in mixture. But though boiling be thus the most economical practice, it is not always to the taste of individuals, or even of whole nations to use the broth or soup. The English and Irish, for example, rarely follow this practice, while the Scots, French, and Germans, prefer it to all other modes of cooking. In general, then, it should seem, that roasting as it is the simplest, is also the best mode of rendering the flesh of animals fit for human food. Roasted meat is wholesome and highly nourishing; and when there is not too much of the empyreumatic crust formed, it is for the most part easily digested. In these respects, broiled meat differs little from such as is roasted. What is fried is always less tender. It is often found that roasted or broiled meat sits more easily on the stomach, and is sooner digested by those whose digestive organs are feeble or diseased, than fried or boiled meat, or broths and stews.