. Some points in the surgery of the brain and its membranes . ^^os-d /^ a-/^-7 PREFACE This little book contains the material preparedfor the Lettsomian Lectures of the MedicalSociety of London for 1906. The short timedevoted to a lecture, and the large amount ofmaterial available for each one, made me decideto give the Lectures as lantern demonstrations. Previous to 1906 the Lettsomian Lectures havebeen delivered for fifty-five years. It is interest-ing to note that the subject chosen by me hadnever before been selected by a Lettsomianlecturer. I heartily thank the many friends v^ho havebeen


. Some points in the surgery of the brain and its membranes . ^^os-d /^ a-/^-7 PREFACE This little book contains the material preparedfor the Lettsomian Lectures of the MedicalSociety of London for 1906. The short timedevoted to a lecture, and the large amount ofmaterial available for each one, made me decideto give the Lectures as lantern demonstrations. Previous to 1906 the Lettsomian Lectures havebeen delivered for fifty-five years. It is interest-ing to note that the subject chosen by me hadnever before been selected by a Lettsomianlecturer. I heartily thank the many friends v^ho havebeen willing to let me have the use of theirillustrations. I thank Dr. Charles Green forlooking up many cases for me, and my brother,Hamilton Ballance, for the illustrations and notesof specimens in the Norwich Museum. Since the Lectures were delivered some caseshave been brought up to date, and a few havebeen added. Fresh from a visit to the great hospitals and vi . SURGERY OF THE BRAIN laboratories of Philadelphia and Baltimore, I amimpelled to express my admisomepointsinsurg00ball


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