1919. Does influenza confer immunity? Abstr. in Jour. Am. Med. Ass. Ibid., 529. SELTER, H. 1918. Zur Aetiologie der Influenza. Deutsch. Med. Woch, XLIV, 932. SHERMAN, C. L. 1913. Common infections that are often erroneously diagnosed as grip. Jour. Am. Med. Ass., LXI, 1567. SICILIANO, L. 1919. Qualche osservazione sull’epidemiologia dell’influenza. Riv. crit. di Clin. Med. Firenze, XX, 97. SILVESTRI, I. 1919. Quinine, malaria and influenza. Abst. in Jour. Am. Med. Ass., LXXIII, 304. SMALL, W. D. D. 1920. Clinical features, etiology and treatment of influenza. Edinb. Med. Jour., XXV, 15. SMITH, THEOBALD. 1904. Some problems in the life history of pathogenic microorganisms. Am. Med., 711. SOLDAN, C. E. 1919. Influenza in Lima. Abstr. in Jour. Am. Med. Ass., LXXII, 970. SOPER, GEORGE A. 1919. The influenza-pneumonia pandemic in the American Army camps during September and October, 1918. Science, N. S., XLVIII, 451. 1919. The efficiency of existing measures for the prevention of disease. Jour. Am. Med. Ass., LXXIII, 1405. 1919. What is influenza? Boston Med. and Surg. Jour., CLXXXI, 635. 1919. Influenza in horses and in man. N. Y. Med. Jour., CIX, 270. SPEAR, B. E. 1920. The periodicity of influenza. Lancet, I, 889. SPOONER, L. H., SCOTT, J. M. AND HEATH, E. H. 1919. A bacteriologic study of the influenza epidemic at Camp Devens, Mass. Jour. Am. Med. Ass., LXXII, 155. STALLYBRASS, C. O. 1920. The periodicity of influenza. Lancet, CXCVIII, 372. STANLEY, ARTHUR. 1918. Notes on pneumonic plague in China. China Med. Jour., XXXII, 207. STANLEY, L. L. 1919. Influenza at San Quentin Prison, California. Public Health Reports, XXXIV, 996. STIVELMAN, B. 1919. Effects of influenza on pulmonary tuberculosis. New York Med. Jour., LX, 20. STURROCK. 1905. Notes on an epidemic of influenza, occurring in the Midlothian and Peebles Asylums. Brit. Med. Jour. SYDENSTRICKER, EDGAR. 1920. Difficulties in computing civil death rates for 1918 with especial reference to epidemic influenza. Public Health Reports, XXXV, 330. 1918. Preliminary statistics of the influenza epidemic. Public Health Reports, XXXIII, 2305. TEISSIER, J. 1920. La grippe parallèle des deux grandes pandémies de 1889 et de 1918. Paris Méd., XXXV, 69. TELLING, W. H. M. AND HANN, R. G. 1913. Influenza with repeated rigors. Practitioner, 764. DE LOS TERROROS, C. S. 1919. Influenza in children. Abstr. in Jour. Am. Med Ass., LXXII, 764. TOPLEY, W. W. C. 1919. The spread of bacterial infection. Lancet, II, 1, 45, 91.