DESCRIPTIONS OF PATHOGENS BACTERIA. IQI 



indeed, they were regarded by Emmerich as 

 the cause of Asiatic cholera. Cases of cholera 

 nostras in which the comma bacilli of Finkler- 

 Prior were found, have been recorded by Fink- 

 ler-Prior, Lustig, Gruber, Ruete and Enoch. 

 Zorkendorfer found in one case still a different 

 kind of comma bacillus, and in another case 

 Beck found streptococci. 



Typhoid Fever. The bacteria of this disease 

 were first demonstrated microscopically by 

 Eberth and Koch, and in 1884 were cultivated 

 by Gaffky. They are short plump rods with 

 rounded ends, often joined in filaments. They 

 stain in sections less readily than many other 

 bacteria, and in consequence of plasmolysis 

 show granulation and polar granules. Endo- 

 genous spores are not found, so that the germs 

 must be placed with the arthrobacteria. Gram's 

 coloration is negative. They are actively mo- 

 tile and possess flagella on the ends and sides. 

 The size of the rods varies very greatly and 

 according to the media in which they are 

 growing. They grow at the room and at blood 

 temperatures and are not fastidious about their 

 food-substance. Upon gelatin they form white, 

 irregular, often leaf-shaped colonies which 

 spread over the surface in a fine iridescent 

 film. Upon certain potatoes they do not grow 

 at all, upon some they form a delicate yellow 



