THE CLASSIFICATION OF BACTERIA 351 



1. Mycobact. leprae (Hansen) Lehmann-Neumann 



B. lepra Hansen : Ueber die Aetiol. des Aussatzes, in Norsk. Magaz. for Laegeve- 



densk, Christiania, 1874, Heft IX. 

 Mycobact. lepra Lehmann-Neumann : Bak. Diag., 1896, 372. 



Morphology. Bacilli thin rods of about the same size as tubercle bacilli, 

 straight slightly curved, occur singly or in twos, often tapered at one or 

 both ends. Stain uniformly or irregularly, and by Gram's method. 



Habitat. Found in large numbers in leprous lesions, in the round cells of 

 granulation tissue of tuberculous nodules, in lymphatic spaces, in endo- 

 thelial cells, and in the walls of blood vessels. 



2. Mycobact. syphilidis (Schroter) 



Syphilis bacillus Lustgarten: Med. Jahrb. der K. K. Gesellsch. der Aerzte in 



Wien, 1885. 

 B. syphilidis Schroter: Pilze Schles., 1886. 



Morphology. Bacilli similar to tubercle bacilli, 0.2-0.3 : 3~7 fh often bent, S- 

 formed, or clavately swollen or irregular, with irregular staining. In the 

 tissues occur singly or in clumps. Stain by Gram's method ; resist de- 

 colorization with alcohol. Cultures not known. 



Habitat. Found in the lesions of syphilis. 



3. Mycobact. influenzae (Pfeiffer) 



B. influenza R. Pfeiffer: Zeitsch. f. Hygiene, XIII, 1893. 



Morphology. Bacilli 0.2 : 3-5 p, commonly in twos. Stain with Loffler's 

 alkaline blue and carbol fuchsin. Not stained by Gram's method. On 

 agar moistened with blood, in 24-48 hours, small glassy drops ; older 

 colonies have yellowish-brownish centres. 



Nastiukoff''s solution. 1 In 24 hours, at 37 , small white flecks at the bottom 

 of the tube composed of chains of bacilli. 



Nastiukoff''s agar. 1 Colonies as small gray points, which microscopically 

 are round yellow and translucent. 



For the differential diagnosis make (1) cover-glass preparations from bron- 

 chial secretions, sputum, etc., and (2) smear cultures on agar moistened 

 with blood, and plate cultures with Nastiukoff 's agar. 



Habitat. Isolated from nasal and bronchial secretions and urine of man 

 affected with influenza. 



1 For the preparation of Nastiukoff 's media see Centralblatt f. Bakteriol., XVII, 

 492. 



