Abstract
1) The resistance of mice to marine leprosy did not develop by vaccination with thesimple phenol-killed tubercle bacilli.
2) Development of leproma progressed more slowly in mice vaccinated with liquid paraf-fine vaccine of tubercle bacilli or murine leprosy bacilli killed by phenol than in the controls, but the grade of resistance afforded to the treated mice was of the lower order than thatinduced by vaccination with living B.C.G.
3) No effects on tuberculous infection was found in the group of mice injected with liquidparafline vaccine of killed murine leprosy bacilli.
