BACILLUS CHOLER7L SUIS 83 



EXERCISE XXXI 



BACILLUS CHOLEKjE SUIS AND BACILLUS TYPHOSUS 

 [cojitinued) 



123. Work for this exercise. Reexamine and complete the 

 notes on all of the cultures except the milk and litmus milk. 

 Carefully observe the reaction of all the liquid cultures. 



Compare the colonies on the gelatin plates with those of 

 B. coli communis. 



Make a careful comparison, in tabulated form, of the mor- 

 phology, including measurements, of the bacilli themselves 

 and of the appearance of the growth in the different cultures 

 of £. coli communis and the bacilli of hog cholera and typhoid 

 fever. Add the cultural characters of the paracolon bacillus. 



The cultures, excepting those in milk, can be rejected now, 

 or, if desired, they may be kept for further study and com- 

 parison. Inoculate the media in Groups A and B with the 

 bacillus of dysentery from a culture furnished. 



