102 SPIROCILETES. 



SPIROCH^JTA VINCENTI. 



(Blanchard, 1906.) 



This spirochaete is met with in the affection known as 

 Vincent's angina (a form of oral and pharyngeal ulcer- 

 ation described by Vincent) along with fusiform bacilli. 

 The spirochastes are usually about lo// long (extreme, 

 40 fi, Mackie) ; they show rather sluggish movements 

 (see Fig. 53). Plaut describes an euglenoid movement, 

 or gradual swelling of the organism, passing like a wave 

 along its length. These spirochaetes are constantly 

 associated with fusiform bacilli, of which some writers 

 believe them to be a developmental form (see page 43). 

 These or very similar associated organisms are found 

 not only in the throat, but also in gangrenous processes 

 in other parts of the body. The spirochaetes have not 

 been satisfactorily cultivated, but the bacilli may be 

 grown on artificial media. 



The resemblance of this organism to Sp. buccalis is 

 very close, and some writers believe that they are 

 identical (compare also Sp. gracilis) . 



SPIROCH^ETA GRACILIS. 



(Veszpr6mi, 1907.) 



This organism, found by Veszprdmi in a case of ab- 

 scess in connexion with the jaw, in a man, appears to be 

 identical with Sp. vincenti. It occurred along with 

 fusiform bacilli and cladothrix. Levaditi and Stanesco, 

 however, obtained this organism (?) from a chancre and 

 cultivated it by Schereschewsky's method. They state 

 that it is a distinct species, almost indistinguishable 

 from Sp. pallida : it exhibits, however, rather less regu- 

 lar spirals, is rather thicker, moves more actively, and is 

 stained blue by Giemsa's method. The description is 

 suggestive of Sp. microgyrata or Sp. pseudo- pallida. 



