THE COLONY MORPHOLOGY OF TUBERCLE BACILLI : I. THE PRESENCE OF SMOOTH COLONIES IN STRAINS RECENTLY ISOLATED FROM SOURCES OTHER THAN SPUTUM.

In the cultures of bovine strains from tissue treated with NaOH, 46 per cent of the positive cultures showed smooth colonies; of the H~SO4-treated, 54 per cent; and of the untreated, 63 per cent. In the cultures of human bacilli from tissue treated with NaOH, 30 per cent of the positive cultures showed smooth colonies; with HgSO~, 35 per cent, and the untreated showed 61 per cent, differences which we believe to be highly significant.

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