Acknowledgments to works of reference and authorities have been made in the text. But in addition, and without thus seeking shelter for doubtless many shortcomings, I am much indebted for help of various kinds to Professors P. H. Winfield, H. R. Dean, J. Barcroft, and A. C. Seward, Drs J. A. Venn and W. H. L. Duckworth, Lady Thomson, R. E. Priestley, First Assistant-Registrary of the University of Cambridge, and L. W. G. Malcolm, Conservator of the Wellcome Historical Medical Museum. For great assistance with the indexes I would express my gratitude to Horace M. Barlow, Bedell and Secretary, Royal College of Physicians of London.