In a study of 102 bronchograms for purposes of comparing the contrast medium Visciodol(R) (a mixture of iodized peanut oil and powdered sulfanilamide) with Iodochlorol(R) (an iodized poppyseed oil), it was observed that Visciodol is more readily administered, produces better bronchograms with less alveolar filling and clears from the lungs far more rapidly and completely than does Iodochlorol. Certain even newer highly promising agents are available but specific results with them are not included with this report. Bronchography is a diagnostic procedure that is contraindicated when the information to be gained does not exceed the probable risk.