CLASSIFICATION OF THE BACTERIA. 89 



B. rnber, Cohn. 



Long rods, isolated or united in two or four, 

 movement very active ; in a red mucous sub- 

 stance, vermilion, developed upon grains of rice. 

 Observed by Franck and Cohn. 



B. anthracis, Cohn. 



Found in the blood, and especially in the 

 capillary blood-vessels, of animals affected with 

 anthrax. From 5 to 20 /x in length, and about 

 1 p, in thickness, straight or slightly curved, 

 truncated, motionless ; growing in culture-solu- 

 tions into long filaments, which are often twisted 

 into bundles. These filaments appear to be 

 homogeneous, but by the use of staining re- 

 agents the protoplasm is seen to be divided into 

 cubical masses contained in a hyaline sheath. 

 Oval spores are developed at intervals in these 

 filaments when they have free access to oxygen. 

 (See Plate VIII.) 



B. tuberculosis, Koch. 



Found in the sputum of phthisical patients, 

 in tubercle nodules wherever found, in caseating 

 scrofulous glands, in bovine tuberculosis, etc. 

 Extremely slender, somewhat flexible rods, 

 having a length of one-quarter to one-half the 

 diameter of a red blood-corpuscle (Koch), mo- 

 tionless, and scarcely discernible except when 

 stained ; often containing very minute spores. 

 (See Plate IX.) 



