248 INFECTIVE DISEASES. 



liacilhis wliicli was found liy him in the imi-uleiit ln-onchial secretion, 

 ,ani.], )>y Canon, in tlie blood. 



Bacillus of Influenza. — Very small rods, singly or in leptothrix 

 filaments. They stain with the aniline dyes, but not by Gi-am's 

 method. They are non-motile and aerobic ; they do not grow in 

 gelatine at the temperature of the I'oom. On giycei'iue-agar very 

 small transparent droij-like colonies develop in about twenty-four 

 houi's. In broth there is only a very scanty growth of whitish 

 particles on the surface, which subside and form a woolly deposit. 

 They ai-e found especially in the bronchial secretion, and only in 

 cases of influenza. Canon obtained them by puncturing the finger, 



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Vie. 121.— B.iCILLUS OF IXFLUENZ.V. 



From a culture on gelatine, x 1000. (Itzekott and Niemann.) 



and allowing a few drops of the blood to fall upon the surface of 

 glycerine-agar in a Petri's dish. The oi'ganism will retain its 

 vitality for fourteen days in sputum, Ijut is quickly detroyed by 

 drying. It is said that by applying the bacillus to the nasal 

 mucous membrane in monkey's, symptoms .similar to influenza were 

 produced. 



Method of Staixixg. 



To stain the bacilli use jSTeelsen's solution or Liiffler's methylene- 

 blue ; or the following method : — 



Canon's method. — Spread the blood on cover-glasses, allow them 

 to dry, immerse for five minutes in absolute alcohol, and stain in the 

 folloTOng solution : — 



