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Hydrocephalus and the Cerebrospinal Fluid, by Thomas Herrick Milhorat, M.D. Baltimore: The Williams & Wilkins Co., 1972, 237 pp., $18.50

It is now almost 50 years since the publication of Harvey Cushing's Cameron Prize Lecture, The Third Circulation and its Disorders. The prodigious increase in knowledge of that circulation in the intervening years and the application of that knowledge to the treatment of hydrocephalus are reflected in Milhorat's book, while the limitations of our present position are not overlooked. The author, who is deeply involved with problems of hydrocephalus both as a clinician and an investigator, has provided an excellent appraisal of current understanding and practice.