=d. Heterodermic Skin-grafting.=—In this mode of skin-grafting the pieces of skin are taken from freshly amputated limbs of one patient or from any selected part of the body of the newly dead, and placed upon the defects to be covered in another patient. These grafts have been successfully employed even after ninety-six hours had elapsed between the time of amputation or the death of a person and the taking of the skin-grafts. The method employed is as follows: The site of the amputated member or dead body from which the skin is to be taken is thoroughly cleansed, as in the Thiersch method. Pieces of the skin, including the subcutaneous tissue, but no fat, are cut from the cleansed parts. These sections are cut into smaller pieces, about one inch square (_Hartman_ and _Weirick_), and placed upon the granulating surface to be covered, leaving one-half-inch wide interval between each piece. The grafts are then covered with overlapping narrow strips of rubber tissue, over which a normal saline dressing is applied. The outer dressing is composed of gauze saturated with the same solution. These dressings are changed every twenty-four hours. The grafts will soon be found to adhere, showing a pinkish color in about six days; those showing a tendency to undergo gangrene or a laziness of attachment at this time are removed. In about two weeks the epitheliar surfaces of these grafts are thrown off, as with other grafts already mentioned, and shortly thereafter a new, deep-pink epithelium is formed, the ends of the grafts throw out epitheliar cells, which soon coalesce with those of the neighboring grafts, eventually taking on the normal appearance and vitality of skin. _3. Zoödermic Skin-grafting_ The advantage of using zoödermic grafts is that the patient is saved the ordeal of general anesthesia and the secondary wound occasioned by the removal of the graft, which necessarily leaves more or less of a scar. The grafts for this purpose may be taken from freshly killed animals, such as dogs, rabbits, frogs, kittens, etc. The best results, in the estimation of the author, are obtained by the use of the skin taken from the abdominal region of dogs. The method for preparing these grafts is to kill a healthy animal, thoroughly cleansing the skin of the abdomen, as already described in the taking of any graft. The entire abdominal surface is neatly shaved under antiseptic precautions and the skin is dissected off in one piece, leaving the subcutaneous tissue. It is then placed in a warm boric-acid solution and cut into small pieces, say one or two inches square, according to the size of the defect to be covered.