AND CONTENTS OF THE MOUTH. 71 



Strings of very minute cocci, morphologically identical with those 

 of type s (Fig. 2). 



Such specimens, as well as diplococci with the capsular appear- 

 ance of type / (same figure), reproduced in d' (Fig. 4), are num- 

 berless. These diplococci are of two sizes, large or medium of 

 type / (Fig. 2) and others, surrounded likewise by a clear sheath, 

 but small, as in d' (Fig. 4, right). The small cocci enclosed in If' do 

 not differ materially from those of the beaded forms (with the 

 exception of being surrounded by a sheath). I have observed that 

 these minute diplococci are the heavier, because they are found 

 mostly on the slide, whilst the large diplococci adhere to the 

 cover-glass. 



Now, the specimen drawn in I? shows that the beaded forms, 

 morphologically identical with the bacilli of Koch, are found in 

 the patina dentaria, as well as in the solid and stagnant substrata, 

 viz., within the buccal epithelia or in the morbid secretions, either 

 in the crypts of the larynx or the tubercular products, in so far as 

 the inactivity of the part favours the multiplication of the lineal 

 series of cocci, which first form strings of beads and then small 

 rods or filaments, as I have already demonstrated. 



In the second place, from this specimen, I believe there exists 

 a close affinity between those beads and diplococci, either of the 

 buccal cavity or of some other habitat ; otherwise I cannot under- 

 stand why they should be so close together as to resemble fru^s 

 fallen from the same tree. 



Another example of the tendency those minute cocci have to 

 adhere to the diplococci is seen in /. 



{c) The couples of dumb-bell bacteria herein shown (magnified 

 to 2,500 diameters) are taken from the nasal mucus in its normal 

 condition. I contend that they do not differ at all from the ordi- 

 nary dumb-bell and chain-like bacteria found in the sputa upon 

 the types c, d, e (Fig. 2), which remind us of the form and size of 

 Bacterium termo. 



On examining thick nasal mucus, I met with myriads of such 

 bacteria. In this case the material to be examined must be taken 

 from the dry cavities of the nose by a glass rod. 



We shall see that those dumb-bell bacteria are more apt to form 

 chains ; in fact, they constitute the remarkable groups or bundles 

 of chain-like bacteria found on the surface of the tongue. 



