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This book remains by far the best reference available in English on the subject. In this edition less than half the chapters have undergone revision. An important addition is the excellent chapter on the use of the electroencephalogram in cases of head injury by Dr. P. F. A. Hoefer.
The book is a symposium by twenty-three authorities from the United States, Canada and Great Britain. The policy of partial revision, presumably dictated by the times, makes for some unevenness. For example (page 90), the statement "So little is known of the mechanism of headaches in general that it is not surprising that we are at a loss for a complete explanation of those which are traumatic" may have been so in 1938 or 1939, when it was written, but hardly pertains since the definitive work of Harold Wolff and his collaborators.
Possibly Air Commodore Symonds would have considerably more to