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In the following pages will be found the substance of three Lectures which I delivered as Hunterian Professor at the Royal College of Surgeons in February last.I have largely been enabled to carry out the researches of the past five years therein detailed, through the munificence of the Worshipful Company of Grocers. This volume contains a report of the work done by me as their Research Scholar. In writinof some of the sections of this work I have drawn on papers previously published by me in the Proceedings of the Royal Society, the Journal of Physiology, and the British Medical Journal; other sections, such as those on the Cerebral Pulsation, the Cerebro-spinal Fluid, Cerebral Anaemia, and Cerebral Compression are new, and contain an account of experiments hitherto unpublished.I have been partly supplied with the means of research by grants from the Royal Society Government Grant, and the British Medical Association; and I owe a debt of gratitude to Professor Burdon Sanderson, Professor Schäfer and the Authorities of the London Hospital Medical College, whose laboratories and laboratory appliances have been placed at my disposal.
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