This is a fifth and revised edition of a well known textbook of neurology. The author's statement in the preface gives as good a summary of the changes in this new edition as one can give. “The brief period of four years since the last edition appeared witnessed a number of advances in neurology: Chemotherapy of meningitis is practically new; headache is better understood; and electroencephalography, ‘degenerative’ diseases, and the autonomic nervous system, have all received further study. Quite a few new syndromes demanded inclusion, and a number of minor and major changes, too numerous to mention, had to be made. But while I feel that the book has been considerably enriched, it has not been unduly expanded.”