COSMIC RADIATION AND TUBERCULOSIS Ⅲ. INFLUENCE OF COSMIC RADIATION ON TUBERCULOSIS AT HIGH ALTITUDE AND AT SEA-LEVEL

<正> Previous experiments have shown that there arc three factors which are important for the treatment of tuberculosis, i.e. cosmic radiation, barometric pressure, and daylight with ultra-violet light. As to cosmic radiation, tuberculous mice exposed to cosmic radiation at sea-level under 2 and 10 cm of lead showed a significantly greater mean survival time than that of tuberculous mice exposed to direct cosmic radiation. Furthermore, tubercle bacilli exposed to cosmic radiation at sealevel under 2.1, 7.4, and 9.5 cm of lead showed a strong attenuated virulence and also possessed a strong immunizing property.