While this course is being gone through, any eruption on the skin, or warts, tumours, or scars resulting from their removal, will come under notice. Pimples and nodules on the skin of grey horses, especially in the region of the flank, about the sheath, perineum, or anus, are always suggestive of a form of growth (melanosis) of a malignant character. Eruptions behind the knees and in the bend of the hocks, termed respectively " mallenders" and " sallanders", interfere with action, and sometimes altogether unfit the horse for work, in which case they constitute an unsoundness; and the same may be said with regard to the disease termed " grease", and all other eruptions when occurring on parts of the body where they will interfere with the animal's services.