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They are in general all the Veins and Arteries of the Body, nevertheless some of 'em are more especially appropriated to this Operation; as the Vena Pr�parata in the Forehead; the Ranul� under the Tongue; the Jugular Veins and Arteries in the Neck; the Temporal Arteries in the Temples; the Cephalick, Median, and Basilick Veins in the inside of the Elbow; the Salvatella between the Ring-Finger and the Little-Finger; the Poplit�a in the Ham; the Saphena in the internal Malleolus or Ankle; and the Ischiatica in the external.

H-shaped incision.—The internal incision should commence at a point about two inches below the articular surface of the tibia, and in a line with its inner edge; it should then be carried up along the femur in a direction parallel to the axis of the extended limb, so as to pass in front of the saphena vein, and thus avoid it, for a distance of five inches.

The saphena vein can generally be recognised, and is almost always safe out of the way of this incision at its inner side.

The blood spavin is situated in front and to the inside of the hock and is merely a varicose or dilated condition of the saphena vein.

Clinical Features.—The most typical example of this form of phlebitis is that so frequently met with in the great saphena vein, especially when it is varicose.