204 BACTERIOLOGY 



** Only slightly pathogenic to guinea pigs. 



43. B. meleagris. 



44. B. tetraonis. 

 *** Pathogenic to guinea pigs. 



45. B. cygneus. 



b. Not pathogenic to birds ; scarcely pathogenic to other animals. 



46. B. aerobius. 



47. B. pneumosepticus Kruse. 



c. Pathogenic to insects. 



48. B. monacha Tubeuf. 



2. Gelatin colonies of the aerogenes type. 



a. Pathogenic to the smaller animals. 



* Rabbits, general infection. 



49. B. cuniculi. 



50. B. venenosus Vaughan. 

 ** Pyogenic to the smaller animals. 



51. B. glischrogenus Malerba. 



b. Non-pathogenic. 



* Do not grow at 37 , water bacteria. 



f Growth on agar smooth, not characteristic. 



52. B. a/bus Paglinni. 



53. B. granttlatus. 



ff Growth on agar branched (rhizoid). 



54. B. stolonatus Adametz. 



3. Colonies burr-like. 



55. B. invisibilis Vaughan. 



56. B. venenosus Vaughan. 



4. Colonies show a coil-like (Knauelartig) structure. 



57. B. murinus. 



5. Colonies not characterized as in 1-4. 



B. DENITRIFICANS GROUP 



a. Grow only with difficulty on the surface of gelatin plates. 



58. B. denitrificans Burri-Stutzer. 



b. Grow on the surface in gelatin plates. 



* Produce only a faint turbidity in nitrate bouillon, becoming 



clear ; a membrane on the surface. 



59. B. Stutzeri (Lehmann-Neumann). 



** Produce a marked or strong turbidity in nitrate bouillon, with 

 the formation of a membrane. 



