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This volume is subtitled A Quantitative Study of the Frontal Lobes and is addressed “to those investigators and students in medical and nonmedical sciences whose problems transcend professional boundaries.” The results are based upon individual examinations of approximately two hundred and fifty subjects. It is a very significant contribution. It was deemed necessary to find a new measuring framework. A fairly thorough review of previous work is given. A battery of twenty-seven neuro-psychological tests was used. A four-factor description of performance was yielded. These factors were found to be valid for differentiating the effects of brain injury and have been made the basis of a theory of biological intelligence. The four factors are a central integrative field factor, a factor of abstraction, a power factor and a directional factor. Part two of the volume covers the extent to which the above factors as represented in the brain was tested. An impairment index has been developed. Where there is damage to the frontal lobes there is a high impairment-index score. No quantitative evidence for hemispheral dominance was found. No evidence was found for a general principle of mass action. The impairment is not referable to any sensory or motor defects. Biological intelligence is said to be a basic function of the brain. “The frontal lobes, long regarded as silent areas, are the portion of the brain most essential to biological intelligence. They are the organs of civilization—the basis of man's despair and his hope for the future.” If the latter statement of the author's is true, one wonders at a possible psychological explanation as to why the frontal lobes are so avidly attacked today; mayhap castration factors are yielding to even larger depredations. Those who wish to solve problems that transcend professional boundaries and who have such problems should accept the invitation of the author to read this volume. Let us hope there are many of them and let us hope they