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In this monograph Benedek describes a new method of localizing lesions of the brain. He has attempted to differentiate by a most elaborate system and rather complicated apparatus the various notes that may be produced by percussion of the head and be observed by auscultation. He has made a large number of measurements of various points on the skull in order to establish the average thicknesses at each. These are recorded in twenty-three tables. In drawing 19, he then classifies the various percussion notes one may elicit into twelve types.
Benedek has been developing this method since 1917, and he published his first observations in 1923. He cites a number of case histories to prove his thesis that the method makes it possible to diagnose conditions that could not otherwise be recognized. Unfortunately, a number of his cases are not confirmed by operation or autopsy. He records on page 100