718 ADDITIONAL, SPECIES OF 



Morphology. Bacilli with round ends, from 4 to 12 n long, and usually 

 containing a spore at one extremity. Resembles the bacillus of tetanus, but 

 is considerably thicker. 



Biological Characters. An aerobic, liquefying, motile, chromogenic 

 bacillus. Foi'ms spores. Grows in the usual culture media at the room 

 temperature. Produces a red pigment. In gelatin stick cultures liquefac- 

 tion in funnel form occurs along the line of 

 puncture. In old gelatin liquefaction may not 

 v * occur. Upon the surface of nutrient gelatin a 



s I red streak is developed along the line of in- 



t** s |l oculation, and the gelatin below this is very 



"* \ , N ' \ * v ^ slowly liquefied. The colonies in. gelatin plates 



* V * '3 may attain a diameter of two millimetres; 



i ^ / ^ i \ they have a pale-red centre with a deeper red 



N % \ . ' o periphery, and are disc-shaped. In bouillon 



~ A! * * i \ I development is abundant, but without the for- 

 I. ^ "S. mation of pigment. Does not grow well upon 



.* x* ./ potato. Pigment is formed more abundantly 



l x * ' * at 10 to 15 3 C. than at a higher temperature. 



Upon dried codfish it grows readily, forming 

 a red pigment, especially upon the side which 



FIG. a65.-Bac.llus of Dantee. hag ^ exposed { o the ^. lt 



Not pathogenic. 



453. BACILLUS (MICROCOCCUS ?) HAVANIENSIS (Sternberg). 



Morphology. Short-oval bacilli, usually in pairs, about 0.4 to 0.5 u in 

 diameter. The cells are so nearly spherical that the writer has been in doubt 

 whether to describe this microorganism as a bacillus or as a micrococcus. 



Biological Characters. An aerobic, non-liquefying, chromogenic ba- 

 cillus(?). Grows slowly in the usual culture 

 media at the room temperature. Upon gelatin 

 plates forms small, spherical, translucent colo- 

 nies of a beautiful blood-red color. In gelatin 

 stick cultures a thick, opaque, carmine layer 

 develops about the point of inoculation and 

 slowly increases in thickness and circumference ; 

 very scanty growth, without color, at the upper 

 part of the line of puncture. Upon the surface 

 of agar the growth is slow but continuous, and 

 forms, at the room temperature, a thick, carmine 

 layer along the line of inoculation ; this has 

 wavy outlines and a glistening, varnished-like 

 surface ; it gradually extends in thickness and 

 breadth, which at the end of a month may bo FlG - 266. -Bacillus Havanien- 

 five to six millimetres. Frequently this micro- sis - x 1,000. (Sternberg.) 

 coccus fails to grow on potato, perhaps because 



of an acid reaction. But upon old and rather dry potato it sometimes de- 

 velops, as it does on nutrient agar, forming a thick, irregular mass of a 

 carmine color. The pigment is only formed in the free pi'esence of oxygen. 



454. BACILLUS AMYLOZYMA (Perdrix). 



Obtained by Perdrix (1891) from the hydrant water of Paris best from 

 the deposit left in a Chamberlain filter through which this water has been 

 passed. 



Morphology. Bacilli with round ends, from 2 to 3 n longandO.5// 

 broad ; usually in pairs, or in chains of several elements. 



Stains with the usual aniline colors. 



