The former will generally heal up without much trouble, but the latter, when extensive, sometimes two or three inches in length, by requiring uniting by one or more sutures, to prevent deformity. WARTS. When these little excrescences appear on the external or internal portions of the flap, they may be taken off with the knife, and caustic applied to the wound, to induce them to heal, and keep down further granulations. CANKER OF THE EDGE OF THE FLAP. When a corroding sore of this nature attacks the edges of the ear, and refuses to yield to the application of a few stimulating washes, such as sulphate of copper, alum, borax, nitrate of silver, &c., the diseased edges may be paired off, and the actual cautery applied to the parts. This will frequently arrest its further progress. POLYPUS OF THE EAR Polypi often spring up from the interior of the ear; they may be cut off with the scissors, or by the application of a fine wire, or horse-hair ligature. The wound should be touched with caustic, tincture of iodine, or the actual cautery. DISEASES OF THE EAR--MANGY EDGES This affection generally accompanies the same disease in other portions of the body, but may occasionally make its appearance independent of this cause. The edges of the flap become rough, thickened, and furrowed, the itching intolerable; and the dog perpetually shaking and scratching the head, occasions a constant oozing of blood from the wound. Smooth-baited dogs are most subject to this disease, such as pointers, hounds, and terriers. 'Treatment'--Slightly stimulating washes, such as castile soap, alum-water, or infusion of oak-bark, will, in the majority of cases, induce these sores to heal up. If these do not answer, it will be necessary to use the mange ointment, keeping the animal hobbled to prevent him from scratching. Old inveterate cases are best cured by trimming off the affected parts.--L.] CHAPTER X--ANATOMY AND DISEASES OF THE NOSE AND MOUTH ETC. THE ETHMOID BONES. There is some difficulty in describing the ethmoid bones; but we shall not, however, deviate far from the truth if we give the following account: