410 ACTIXOJirCETES. 



Supplementarily, vre may here mention the following : 



Bacillus pseudotuberculosis ovis. (Preisz.) 



The rods are smaller and finer than diphtheria hacteria and stain 

 well by Gram's method. Grows only at iacubator temperature, and 

 upon agar and serum only scantily and dry. Upon bovine serum there 

 is often a striking orange-yellow color. Cultivated from the kidney 

 of a sheep. Injected intravenously into rabbits and guinea-pigs, it 

 prodnces psendotuberculosis (A. P., 1894, 231). 



Bacillus pseudotuberculosis murium. (Kutscher.) 



Similar in many points to the preceding, hut pathogenic for mice 

 only. Cultivated from the lung of a diseased mouse [Z. H. xvm, 

 327"). 



The interesting "sporogenic" pseudodiphtheria baoUlus of De 

 Simoni (C. B. xxiv, 294) scarcely seems to belong here, in spite of 

 certain similarities between it and the diphtheria bacUlus (striped 

 rods). 



2. Mycobacteritim Lekm. and Neiim. 



Cultures upon solid nutrient medium are elevated, more 

 or less wrinkled and dry. ^licroscopically : thin, slen- 

 der rods, often with typical diehotomous branching, 

 sometimes forming unbranched or branched threads. 

 When the rods have been stained '^'ith hot carbol-fuchsin, 

 they give up the stain from the action of acids with great 

 difficulty; they are "acid proof" — i. e., they behave 

 toward stains much like the spores of ordinary bacilli. 



Mycobacterium tuberculosis. (R. Koch.) L. and N. 



(Plate 61.) 



Synonyms. — Bacillus tuberculosis R. Koch. Bacillus 

 Kochii Aut. nonnull. Sclerothrix Kochii MetschnikofE 

 (V. A. cxiii, 70). See page 128. 



Common Name. — Tubercle bacilli. ^ T. B. 



JTnsf Important Literature. — E. Koch (ilitt. aus. d. Gesundheitsamt 

 n, 18S4); Xocard and Eoux (A. P. I, 19); Czaplewsky, TJntersuchung 

 des Auswurfs auf TnberkelbacUlen, Jena, 1891 ; Fischel, Morphologic 



^ In the following we more often employ the common name of 

 tubercle bacillus (T. B.), but in spite of this we do not consider the 

 further application of the scientific name. Bacillus tuberculosis Koch, 

 to be proper. 



