18 - 



1900, and has since been kept in stock in this laboratory (Uni- 

 versity of Chicago). Two years of artificial cultivation have some- 

 what changed its character, but it continues to show several 

 seemingly constant differences from B. inycoidesroseus, its 

 resemblance to which has led to the adoption of the name. 



When first isolated, young cultures showed a large anthrax- 

 like bacillus, non- motile, sporeless; later the organism became 

 somewhat diminished in size. Gelatin colonies are characteristic, 

 but differ from B. mycoides roseus. They appear in three days 

 as minute points, which under low power have a peculiar woolly, 

 wispy look ; as they develop, they become pink, smooth, and raised. 

 Gelatin stab, slow development; a ten day growth is very charac- 

 teristic, a fine feathery development along the needle track, and a 

 raised, smooth, shining pink surface colony. The minute agar colo- 

 nies of 48 hours show microscopically the characteristic wispy fib- 

 rillar branching; high power shows that the branching is made up 

 of transparent beady ramifications extending in all directions. The 

 colonies are larger than those of B. mycoides roseus of the 

 same age. Agar slant culture is unlike B. mycoides roseus 

 in being smooth, moist, and salmon pink in color. Growth on potato 

 differs in the same way, the color deepening in 20 days to red. 

 In bouillon cloudiness appears in 24 hours; later the turbidity 

 increases, and a pellicle of small separate pink colonies covers the 

 surface, falls as sediment on shaking, and is re-formed. Litmus 

 milk shows strong alkali production and characteristic pigment. 

 Otherwise like B. mycoides roseus. 



B. later ice us [?J (Adametz, 72). 



I could not obtain the original description of this organism. 

 Migula (10) describes it as a non-motile rodlet, 35 times as 

 long as thick, slow growing and non-liquefying. Chester (1) adds 

 that the growth on agar is limited, moist, glistening, and reddish- 

 brown to yellowish-brown; bouillon is clear and alkaline, with 

 stringy sediment; potato, thin, moist, and reddish; litmus milk, 

 decolorized and coagulated; indol, negative; no growth at 36 C. 

 Lehmann and Neumann (7), who give a fuller description, 

 with plates, say that milk is not coagulated, the growth is from 

 vermilion to reddish brown ; no gas nor acid is formed from sugar, 

 but traces of indol occur. Their culture was isolated from air and 

 identified from Eisenberg's description (2). 



My culture of B. latericeus, obtained from Krai, does 

 not agree with any of the above. Dyar (73) also notes the aber- 

 rancy of the culture which he received from the same source. 

 Dyar's culture, to which he gives the new name, B. fuse us 

 pallidior, agrees with that here described. 



A short, non-motile bacillus, 11,3 n long, and 0,50,7 (i 

 broad, occurring single and in chains. Gelatin colonies after four 

 days small, granular, with slightly irregular and ragged edges. 

 Stab cultures show a slight needle growth, and on the surface a 



