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In this essay Dr. Duane brought forth his classification of motor anomalies and outlined the symptoms, diagnosis and treatment of the various types of deviation. The present day widespread acceptance of his teachings is proof of the soundness of his views. It is refreshing and stimulating to reread this brochure in its original form and to ponder over how little escaped this master mind. The intervening forty-six years have brought but few changes, and these few have been refinements in operative procedures, etc., with the basic principles remaining unchanged. The beginner in ophthalmology can find nowhere else such a clear exposition of the diagnosis and treatment of the motor anomalies. While this valuable monograph has been freely quoted many times by many authors, the original issue of it has been out of print for a long time. Ophthalmology, therefore, is deeply indebted to Dr. White for republishing it.