164 BACTERIA IN THE SPUTA 



external sources, as the liacilli of tare, potatoes, lactic acid, green 

 pus ; and also of the Micrococcus tetragem/s, of Mycoderma aceti, of 

 Staphylococcus pyrogenes^ aureus^ and albus, to the effect of excluding 

 them from the cultivations. But he touches again upon some of 

 these forms in Chapter IX., as we shall see later on. 



Miller classifies, afterwards, the microbes really constant, or 

 primary, of the buccal cavity, into six different species. Of these 

 we give a list, putting our denominations to each species of Miller. 



Synopsis. 



Miller : Vicentini : 



I — Leptothrix buccalis ( L. Leptothrix buccalis.. 

 hinomitiata). 



2 — Bacillus buccalis 7fiaximus. Fragments of stumps. 



3 — Leptothrix buccalis inaxifna. Stumps. 



4—Jodococcus vaginatus. Special sheaths of bacteria pro- 



ceeding from some reserve 

 gemmules. 



5 — Spirillum sputigeiium. Pointed or virgulated Bacilli 



(copulatory organs ?) 



6 — Spirochcete dentium. Spirillum (fragments of very slen- 



der filaments). 



The above species or types are found in every mouth. The 

 Spirillum spiitigenum is sometimes found, in almost a pure culture, 

 in the carious cavities ; and the Spirochcete dentium near the gums. 

 The cultures from substances uiixed with saliva, acids, alkalies, 

 product of caries, dental mucus gathered out of the ebullition 

 of decayed teeth, do not succeed ; some simple cultures, however, 

 give productions of 15 or 20 articulations of certain species, but 

 these cannot be reproduced a second time. 



I will now sum up the characteristics which Miller attributes to 

 these six primary species, beginning with Leptothrix in7wmi7iata. 



Leptothrix buccalis {Leptothrix innomi?iata). 



The name of Leptothrix buccalis is attributed to Robin, who 

 applied it in general to all buccal microbes. Hallier, Zopf, and 

 all others who wrote on this subject conformed to his opinion, 

 maintaining that the motile bacteria are spores of Leptothrix in 



