VARIOUS BACTERIA WHICH PRODUCE DISEASE IN CATTLE. 



DESCKIPTION OF PLATE XXVIII. 



The bacteria on this plate are partly from tissues, partly from cultures, and 

 stained artificially with aniline colors (fuchsin or methylene blue). Figs 6 and 

 7 are copied from Friinkel and Pfeiffer's atlas. All but fig. 7 are magnified 

 1,000 times; fig. 7, 500 times. 



Fig. 1. Bacteria from pneumonia in cattle. These are also the cause of 

 hemorrhagic septicemia and are closely related to swine-plague bac- 

 teria. These bacteria were drawn from a piece of spleen pulp (rabbit). 



Fig. 2. Micrococci (streptococcus) which produce inflammation of the lining 

 membranes of the abdomen, thorax, heart, brain, and joints. Fre- 

 quently associated with the preceding bacteria in abscesses. 



Fig. 3. Micrococci (staphylococcus) which produce inflammation and sup- 

 puration ; also pyemia. 



Fig. 4. Bacilli of blackleg. The pale oval bodies as well as the light spots 

 in one end of the bacilli represent spores. 



Fig. 5. Bacilli which produce tetanus or lockjaw. The light spot in the en- 

 larged end of each rod represents a spore. 



Fig. 6. Bacilli of tuberculosis. Microscopic sections of a pearly nodule from 

 the lining membrane of the chest cavity. The bacilli are stained red 

 and appear as small straight rods within the cells of the nodule or 

 tubercle. 



Fig. 7. Bacilli of anthrax. Bacilli from the spleen of a mouse inoculated 

 with a culture. The bacilli were obtained from the blood of a cow 

 which died of anthrax in Mississippi. The bacilli appear as rods 

 stained blue. The round bodies are blood corpuscles, also stained 

 artificially. 

 358 



