A dihydric alcohol named phthiocerol of the formula C&H,203 or C3JI74O3 was isolated recently by Stodola and Anderson (1) from wax fractions of the human tubercle bacillus, Strain H-37. Phthiocerol is a crystalline substance which can be purified and identified quite readily, hence it might serve as a convenient means of differentiating between the human… (More)