The =grease= is, in the primary instance, inflammation of the sebaceous glands of the legs; but it soon extends beyond the limits of its origin, and involves the deeper-seated structures. A white leg is more subject to the disorder than one of another color, and the fore limbs are almost exempted from the ravages of grease. The reason of that exemption is found in the greater proximity of the anterior extremities to the heart or to the center of the circulation. Consequently the vitality in the fore legs is more active, and the flow of blood much more energetic; hence the anterior extremities can resist that ailment which fixes with impunity upon the posterior limbs. Added to this, in the fore legs the vessels describe almost perpendicular lines, whereas in the hind members the arterial current is impeded by numerous angles; these conditions doubtless operate upon the health of parts, but, above everything else, ranks the fact that the front legs are not subject to the same external causes as are the members more backwardly located. The stalls are drained from the manger to the gangway; consequently all the contamination of the space in which the horse is confined flows toward the hind feet; there are, moreover, other reasons, which the intelligence of the reader will not require should be particularized. Grease is banished from every decent stable; it may, however, be occasionally encountered in situations very much secluded; there yet remain places whence so foul a disgrace is never absent. The wretched animals which are employed in brick-yards, in dust-carts, and in drawing canal boats are hardly ever free from this loathsome disorder. These creatures labor incessantly, and are removed far from the wholesome check which brutality receives from public opinion; they are resigned to the mercies of men who, as a class, are certainly not the most refined, and are seldom inconvenienced by any excess of feeling. The places, not stables, into which the miserable quadrupeds are thrust can rarely be entered without the peculiar smell which announces the existence of grease almost overpowering the stranger. The fact is unpleasant to human sense, but it is only right that the probable effect upon the creature, which is doomed for the duration of its weary life to inhale such an atmosphere, should be considered.