In a straightforward comparison of the culture virtues of 6 media[long dash]Lowenstein''s Jensen and Holm modification), American Trudeau society (Egg-yolk- potato with 8% glycerin and egg-yolk-potato with 2% glycerin), Petragnani''s (McNabb modification and Frobischer modification) and Dubos'' (oleic acid-albumin-agar with penicillin)[long dash]the Jensen and Holm modification of Lowenstein''s medium was found to have over-all superiority for isolation of Mycobacterium tuberculosis from human sources.