6. B. influenzæ is a frequent etiological factor in purulent and chronic bronchitis, broncho-pneumonia and other acute and chronic respiratory infections, in meningitis, endocarditis, sinusitis, conjunctivitis and other conditions, as well as in complications of many other diseases. 7. There are many carriers of the bacillus among our population, both in apparently normal individuals and in those suffering from chronic infections of bronchi, sinuses or other parts. 8. The problem of what constitutes resistance or susceptibility to this infection are as far from solution as they are in most other respiratory diseases, and the attempts to explain the reasons for epidemics have been as futile as they are for meningitis and many other respiratory epidemics. 9. It would not appear that the immunological reaction against this infection has been discovered, but the possibility of its being of an antitoxic nature opens an interesting field for investigation. BIBLIOGRAPHY Abrahams, Hallows and French Lancet., 1919; i, p. 1. Abrahams, Hallows, Eyre and French Lancet., 1917; ii, p. 377. Abstract of Foreign Literature on Influenza Jour. A. M. A., 1918; lxxi, p. 1573. Adrian Quoted by Tedesko, q. v. Allen Lancet., 1910; i, p. 1263. Averill, Young and Griffiths British Med. Jour., 1918; ii, p. 111. Avery Jour. A. M. A., 1918; lxxi, p. 2050. Babes Deutsch. Med. Wochen., 1892; xviii, p. 113. Batten Lancet., 1910; i, p. 16. Basile Baumgarten Jahresb., 1907; xxiii., p. 284. Beall Jour. A. M. A., 1906; xlvi, p. 1442. Bernstein and Loewe Jour. Infect. Dis., 1919; xxiv, p. 78. Besancon and Griffon Quoted by Scheller, q. v. Besson Text-book, translated by Hutchens, 1913. Blanton and Irons Jour. A. M. A., 1918; lxxi, p. 1988. Boggs Amer. Jour. Med. Sci., 1905; cxxx, p. 902. Brem, Bolling and Casper Jour. A. M. A., 1918; lxxi, p. 2138. Brentz and Frye Woman’s Med. Jour., 1908; xviii, p. 73. Brown and Orcutt Jour. Exper. Med., 1918; xxviii, p. 659. Bruschettini Cent. f. Bakt. Abt. i., 1892; xi, p. 412. Bruschettini Cent. f. Bakt. Abt. i., 1892; xii, p. 34. Bruschettini Cent. f. Bakt. Abt. i., 1893; xiv, p. 253. Bujivid Cent. f. Bakt. Abt. i., 1893; xiii, p. 554. Canon Die Bakteriologie des Blutes bei Infektionskrankheiten Jena, 1905. Canon Deutsch. Med. Wochen., 1892; xviii, p. 28. Cantani Zeit. f. Hyg., 1896; xxiii, p. 265. Cantani Cent. f. Bakt. Abt. i., 1897; xxii, p. 601. Cantani Cent. f. Bakt. Abt. i., 1900; xxviii, p. 743. Cantani Zeit. f. Hyg., 1901; xxxvi, p.