We know from experience that, if young pigs are daily washed, and kept on clean cooked food, they will not eat the common city "swill;" they eat it only when compelled by hunger. When free from the control of man, they show as much sagacity in the selection of their food as any other animals; and, indeed, more than some, for they seldom get poisoned, like the ox, in mistaking noxious for wholesome food. The Jews, as well as our modern physiologists, consider the flesh of swine unfit for food. No doubt some of it is, especially that reared under the unfavorable circumstances alluded to above. But good home-fed pork, kept on good country produce, and not too fat, is just as good food for man as the flesh of oxen or sheep, notwithstanding the opinion of our medical brethren to the contrary. Their flesh has long been considered as one of the principal causes of scrofula, and other diseases too numerous to mention: without doubt this is the case. But that good, healthy pork should produce such results we are unwilling to admit. We force them to load their stomachs with the rotten offal of large cities, and thus derange their whole systems; they become loaded with fat; their systems abound in morbific fluids; their lungs become tuberculous; their livers enlarge; calcerous deposits or glandular disorganization sets in. Take into consideration their inactive habits; not voluntary, for instinct teaches them, when at liberty, to run, jump, and gambol, by which the excess of carbon is thrown off. Depriving them of exercise may be profitable to the breeder, but it induces a state of plethora. The cellular structures of such an animal are distended to their utmost capacity, preventing the full and free play of the vital machinery, obstructing the natural outlets (excrementitious vessels) on the external surface, and retaining in the system morbid materials that are positively injurious. At the present time, there is on exhibition in Boston a woman, styled the "fat girl;" she weighs four hundred and ninety-five pounds. A casual observer could detect nothing in her external appearance that denoted disease; yet she is liable to die at any moment from congestion of the brain, lungs, or liver. Any one possessing a knowledge of physiology would immediately pronounce her to be in a pathological state. Hence, the laws of the animal economy being uniform, we cannot arrive at any other conclusion in reference to the same plethoric state in animals of an inferior order. Professor Liebig tells us that excess of carbon, in the form of food, cannot be employed to make a part of any organ; it must be deposited in the cellular tissue in the form of tallow or oil. This is the whole secret of fattening. At every period of animal life, when there occurs a disproportion between the carbon of the food and the inspired oxygen, the latter being deficient,--which must happen beneath stables and in ill-constructed hog-sties,--fat must be formed.