Experience teaches us that in poultry the maximum of fat is obtained by preventing them from taking exercise, and by a medium temperature. These animals, in such circumstances, may be compared to a plant possessing in the highest degree the power of converting all food into parts of its own structure. The excess of the constituents of blood forms flesh and other organized tissues, while that of starch, sugar, &c., is converted into fat. When animals are fed on food destitute of nitrogen, only certain parts of their structure increase in size. Thus, in a goose fattened in the manner alluded to, the liver becomes three or four times larger than in the same animal when well fed, with free motion; while we cannot say that the organized structure of the liver is thereby increased. The liver of a goose fed in the ordinary way is firm and elastic; that of the imprisoned animal is soft and spongy. The difference consists in a greater or less expansion of its cells, which are filled with fat. Hence, when fat accumulates and free motion is prevented, the animal is in a diseased state. Now, many tons of pork are eaten in this diseased state, and it communicates disease to the human family: they blame the pork, when, in fact, the pork raisers are often more to blame. The reader is probably aware that some properties of food pass into the living organism being assimilated by the digestive organs, and produce an abnormal state. For example, the faculty of New York have, time and again, testified to the destructive tendency of milk drawn from cows fed in cities, without due exercise and ordinary care in their management, giving it as their opinion that most of the diseases of children are brought about by its use. If proof were necessary to establish our position, we could cite it in abundance. A single case, which happened in our own family, will suffice. A liver, taken from an apparently healthy sow, (yet abounding in fat, and weighing about two hundred pounds,) was prepared in the usual manner for dinner. We observed, however, previous to its being cooked, that it was unusually large; yet there was no appearance of disease about it; it was quite firm. Each one partook of it freely. Towards night, and before partaking of any other kind of food, we were all seized with violent pains in the head, sickness at the stomach, and delirium: this continued for several hours, when a diarrhoea set in, through which process the offending matter was liberated, and each one rapidly recovered; pretty well convinced, however, that we had had a narrow escape, and that the liver was the sole cause of our misfortune. Hence the proper management of swine becomes a subject of great importance; for, if more attention were paid to it, there would be less disease in the human family. When we charge these animals with being "unclean creatures of gross habits," let us consider whether we have not, in some measure, contributed to make them what they are.