76 MORPHOLOGY OF THE BACTERIA. 



M. vaccinae, Cohn (Micros^)hcera Vaccince, Cohnj. 

 Very small micrococci, = 0.5 /x scarcely, iso- 

 lated or united in pairs in recent vaccine virus 

 and in the pus of variola pustules. By cultiva- 

 tion, chaplets of from two to eight cells may be 

 obtained, then masses containing sixteen to 

 thirty-two cells of 10 p, and more diameter. 



The M. of vaccine virus and of variola are 

 identical, and Cohn regards them as different 

 races of the same species. 



M. diphtheriticus, Cohn. 



Granular cells, ovoid, measuring from 0.35 to 

 to 1.1 //,, isolated or more often united in twos 

 or in a chaplet of four to six cells ; sometimes 

 multiplying in colonies and extending them- 

 selves in all the diseased tissues, decomposing 

 and destroying them ((Ertel). 



M. septicus, Cohn (Microsporon septicus, Klebs). 

 Little rounded cells, of 0.5 /*, motionless and 

 crowded in masses or united in chaplets, in the 

 secretion of wounds in cases of septicemia 

 (Klebs), in zooglcea in callous ulcers, in isolated 

 cells, united in pairs, or in chaplets in the se- 

 rum of epidemic puerperal fever (Waldyer), in 

 all the tissues, vessels, etc., in cases of pyemia 

 and septicemia. 



M. bombycis, Cohn (Mycrozyma bombycis, Be- 

 champ). 



Cells with a diameter of 1 ^, ordinarily united 

 in chaplets of two, three, four, five, or more, in 



