Medicine: Gangrene Hope

In severe cases of gangrene resulting from frostbite, there is only one proven remedy: amputation. But the Army last week announced a less drastic remedy that looks promising. Its name: heparin, a well-known anti-blood-clotting substance. Heparin apparently stops gangrene by helping circulation in frozen limbs.

Drs. Kurt Lange and David Weiner of the New York Medical College got the idea while studying blood circulation by means of fluorescein, a tracer dye which, injected into the blood, flows freely with it and glows yellow-green under long-wave ultraviolet light. When they froze rabbit tissues (and...