1. Brown, P., Gajdusek, D. C., and Morris, J. A., Science, 166, 117 (1969).
2. Report on the Pandemic of Influenza 1918–1919 (Reports on Public Health and Medical Subjects No. 4) (HMSO, London, 1920).
3. Stuart-Harris, C. H., Andrewes, C. H., and Smith, W., MRC Spec. Rep. Series, No. 228 (HMSO, London, 1938).
4. Andrewes, C. H., Laidlaw, P. P., and Smith, W., Brit. J. Exp. Path., 16, 566 (1935).
5. Shope, R. E., J. Exp. Med., 63, 669 (1936).