Pulmonary Tuberculosis-fohnston et al.BEDICAJ JON,, 1683 46% of the original group. The general acceptability of this regime may well vary in different localities.Since the combination of streptomycin and isoniazid is more effective than P.A.S. + isoniazid it may be possible -to reduce the length of treatment from the generally accepted period of 18 months. We are satisfied that the present results with daily streptomycin + daily isoniazid justify further trials to assess now the optimal duration of these drugs, including possibly an intermittent regime during the later stages of treatment.Conclusions Streptomycin 0.75 g. is an adequate dose and may represent the optimal dose in combination with isoniazid for the treatment of pulmonary tuberculosis.This dose significantly reduces labyrinthine damage. Pantothenic acid has failed to prevent this complication.High