test compaing the ability to hear by air conduction with the ability to hear by bone conduction. By placing the tines of a vibrating tuning fork near the pinna, the acoustic stimulus is presented by air conduction, and by placing the stem of a vibrating tuning fork on the mastoid process, the acoustic stimulus is presented by bone conduction. In conductive hearing losses, the stimulus is heard louder and longer by bone conduction. In sensorineural hearing losses, the stimulus is heard louder and longer by air conduction. The result of the test is reported for each ear as air conduction is found to be greater than bone conduction, or vice versa. This information is combined with the result of the Weber tuning fork test in interpretating the type of hearing loss.