Wahl and his co-workers found that the nasal application of a filtrate from the pneumonic lung of an individual dead with typical influenza-bronchopneumonia failed to call forth any abnormal symptoms in human subjects. The application to the mucous membrane of the nares and nasopharynx of five healthy men, who had been inoculated from four to six weeks previously against influenza with a polyvalent influenza vaccine, and of one uninoculated, of freshly prepared suspensions of four different live strains of Bacillus influenzae, even in massive doses failed to produce any abnormal symptoms. The implantation of living suspensions of Bacillus influenzae produced no material alteration besides the addition of the influenza bacillus itself. When experimentally introduced into the nasopharynx of men the influenza bacillus exists and multiplies for a considerable length of time, two weeks or more. It apparently shows much resistance to the action of dichloramin T. SECTION VI. INFLUENZA AND OTHER DISEASES. _Influenza and tuberculosis._—Following the 1918 and 1920 epidemics of influenza, there has arisen in the literature some controversy regarding the effect, if any, of influenza on tuberculous individuals. This has centered particularly on the question whether tuberculosis produces some degree of immunity to influenza, and whether the latter, on the other hand, predisposes either to the lighting up of a latent tuberculosis, or to a new infection with the tubercle bacillus. Keen observers in the field of tuberculosis who have had apparently equal opportunities to study the effects of the pandemic differ radically in their conclusions. The first mention of consumption following influenza was made in 1580 by Thomas Short.