VARIOUS BACTERIA WHICH PRODUCE DISE.\SE IN CATTLE. 



[Description of PI. XXIX.] 



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 hemor- 

 rhagic septicemia and are closely related to swine-plague bacteria. 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. Frequently associ- 

 ated 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 ap- 

 pear 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 ot 

 anthrax in Mississippi. The bacilli appear as rods stained blue. The round 

 bodies are blood corpuscles, also stained artificially. 



378 



