The indications for treatment are to return the hind limbs into the body of the womb. If they have not advanced too far into the pelvis, this may be done as follows: A rope with running noose is passed over each hind foot and drawn tight around the lower part of the hock; the ropes are then passed through the two rings in the small end of the rotating instrument (Pl. XX, fig. 5) which is slid into the passages until it reaches the hocks, when the ropes, drawn tight, are tied around the handle of the instrument. Then in the intervals between the pains the hocks are pushed forcibly back into the womb. If by this means flexion can be effected in hocks and stifles, success will follow; the hind feet will pass into the womb and clear of the brim of the pelvis and the body may now be advanced without hindrance, the hind limbs falling into place when the hip joints are extended. At the same time the pressure upon hind limbs must not be relaxed until the buttocks are engaged in the pelvis, as otherwise the feet may again get over the brim and arrest the progress of delivery. When the hind limbs are already so jammed into the pelvis that it is impossible to return them, the calf must be sacrificed to save the mother. Cords with running nooses are first put on the two hind feet. The body must be skinned from the shoulders back as far as can be reached, and is to be then cut in two, if possible, back of the last rib. The remainder of the trunk is now pushed back into the body of the womb and by traction upon the cords the hind feet are brought up into the passages and the extraction will be comparatively easy. _Hind presentation with one or both legs bent at the hock._--After the bursting of the water bags, though labor pains continue, no part of the fetus appears at the vulva unless it be the end of the tail. On examination the buttocks are felt wedged against the spine at the entrance of the pelvis and beneath them the bent hock joints resting on the brim of the pelvis below. (Pl. XVII, fig. 3.) The calf has been caught by the labor pains while the limb was bent beneath it and has been jammed into or against the rim of the pelvis, so that extension of the limb became impossible. With the thigh bent on the flank, the leg on the thigh, and the shank on the leg, and all at once wedged into the passage, delivery is practically impossible.