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Dr. Traquair's textbook on perimetry, which has become a classic, now appears in a third edition. In a foreword by Norman M. Dott, the neurosurgeon, the value of quantitative perimetry is emphasized, and it is pointed out that perimetry has now become an integral part of neurologic investigation, that speed of examination is particularly essential and that fatigue of the patient must always be reckoned with. The book is revised and enlarged, with 48 new illustrations, and new advances in this field are recorded. Simplicity of expression and the