METHODS
Organ*. Mycoba;cteri.urm tubtmd~~(vka r. kmi&). Strain H37Rv was
used for most of the work, but some experiments were done with recently
isolated strains. Stock cultures were kept on Liiwenstein-Jensen medium and
for use the organism was subcultured weekly in Dubos medium (Dubos &
Middlebrook, 1947).