Magendie, a celebrated French physiologist, has shown, by experiment, that it is impossible to keep an animal in a healthy state longer than six weeks on one article of diet, death frequently taking place even before the end of that period; but our sheep-farmers, in happy ignorance of the fact, confine their flocks for months to turnips only. And what, may I ask them, is the consequence of the practice? Why, that it is not unusual to meet with sheep-owners who lose at least one out of every fifteen, and all owing, as may easily be proved, to this mode of management. In the first place, the turnip is a kind of food entirely foreign to the nature of the sheep, and one to which, at first, they evince great repugnance. There are many varieties of sheep incapable of feeding on turnips, owing to the form of the face, the upper-jaw projecting considerably past the lower, hindering the chisel-shaped teeth from being brought to bear upon the root. None of our British breeds certainly have this as a regular feature, nevertheless they are liable to it; and there are few farmers that have not, several times in their lives, met with _grun-mouthed_ sheep, as they are called in Scotland, from their profile resembling that of the pig, and suiting them for poking in earth, rather than for eating in the usual way. Again, if the structure of the sheep's mouth proves that it is not adapted for eating turnips, the composition of the turnip no less satisfactorily shows that it is not calculated as food for sheep. Bitterness is essentially necessary in the food of all herbivorous animals; without it, indeed, they sooner or later fall into ill health. This property is shown by chemists to reside in the extractive matter of plants, which has, therefore, been called _bitter extractive_. The quantity is also found to be in the inverse ratio of the nutritive powers of the plant; that is to say, where the plant abounds in alimentary matter, the proportion of bitter extractive is small, compared with what it is where the former is deficient. Turnips contain a large quantity of matter capable of affording nourishment to the body, but they yield little or none of the bitter principle. In consequence of this, sheep acquire fat rapidly for a time, when placed on turnips; but, experiencing a want of the medicinal bitter, begin with equal rapidity to lose the advantages they so recently gained. Their appetite becomes depraved, and, from being shut out from access to the stomachic intended for them by nature, they take to devouring earth, or any substance capable of serving as a substitute for it. "With regard to the natural use of bitter extractive, it may be laid down as a truth, that it stimulates the stomach,--corrects putrefying and unwholesome nutriment,--promotes tardy digestion,--increases the nutritive powers of those vegetable substances to which it is united,--and furnishes a natural remedy for the deranged functions of