AND CONTENTS OF THE MOUTH. l73 



Fungi of the Mouth which may be stained blue and violet 

 with Iodine Colours. — Besides the Bacillus buccalis maximus and 

 the Jodococcus vagi?iatus, Miller points out three others with a 

 striking iodine reaction, viz. : — {a) Jodococcus magnus (Fig. 22), 

 which colours violet ; {b) Jodococcus parvus also stains violet ; and 

 {c) another Jodococcus^ which takes the rose colour with iodine, 

 and can be cultivated a first time, but it does not reproduce in a 

 second culture. 



Fungi of the Mouth which can be cultivated.— Some of these 

 are not pathogenic ; some of a doubtful pathogenic efficiency. In 

 Fig. 23 of the author are depicted several various types of these 

 bacteria of the mouth ; in ^, c^ g, screw forms ; in b, cocci ; in 

 df small rods ; in ^, a sheathed chain of cocci ; in /, a long 

 chain (but these are numberless in the patina of the tongue, so 

 that we beheve it to be impossible to separate them from Lep- 

 tothrix) ; in /, chains of small rods ; and in k, thread forms (to 

 which the same remark applies). 



Miller himself considers it a confusion, difficult to clear up 

 without immense labour, as all the bacteria of the external world 

 can form a nidus in the mouth. The author depicts 19 out of the 

 22 species which he separated in 1885, viz., from Fig. 24 to 27, 

 cocci; 28 to 29, small rods ; and 30 to 31, still longer rods ; in 

 Fig. 32, a Vibrio viridans that liquefied the gelatine and produced 

 a green colouring matter ; a spirillum (Fig. 33) ; long threads 

 (Fig. 35) ; and small chains, partially sheathed (Fig. 34). 



We shall omit seven other types obtained from simple cultures. 



Miller afterwards points out the investigations of Vignal, which 

 he finds fit and accurate. Such investigations led to the cultiva- 

 tion of 17 species of fungi in pure cultures ; some identical with 

 known fungi; others unknown. The more frequent was Bacterium 

 tertfio ; then come Bacillus ulna ; then the Bacillus of potatoes ; 

 three other unknown Bacilli ; the Bacillis subptilis ; then the 

 Staphylococcus pyogt7ius albus\ then the aureus ; five other unknown 

 Bacilli ; and, finally, the Leptothrix. 



From that view, there would result for Vignal a great prepon- 

 derance of bacilli; for Miller, on the other hand, of cocci. Miller 

 attributes this divergence of results from Vignal having used the 



