The average duration of the fracture in the above cases was five months and twelve days, the longest twenty-two months, the shortest four weeks. The mean period required for a cure was nine weeks, the longest nine months, the shortest eighteen days. In one of the cases the treatment was productive of excoriations, in three of severe pain and inflammation.

Cauterization of the ends of the fragments, after free exposure of them by the knife, was successfully employed in six cases; in two others it completely failed. The article most frequently used was the caustic potash. Frictions succeeded in eleven cases.

From a careful analysis of all the circumstances connected with the preceding cases, one hundred and thirty-nine in number, and of which the above is an abstract, Dr. Norris has deduced the following conclusions:—1. That non-union after fracture is most common in the thigh and arm. 2. That the mortality after operations for its cure follows the same laws as after amputations and other great operations on the extremities, the danger being in proportion to the size of the limb and the proximity of the injury to the trunk. 3. That failures after operations are more frequent in the humerus than in other bones, and in middle-aged and elderly persons than in young ones. 4. That the seton, variously modified, is safer, speedier, and more successful than resection or caustic. 5. That incising the soft parts previously to introducing the seton augments the danger, but renders the cure more certain and expeditious. 6. That allowing the seton to remain in for a long time exposes to accidents, and does not facilitate the cure. 7. That the seton is least successful in the femur and humerus.—ED.]

INDEX.

THE END.