328 SAOTERIOLOGY. 



dense white clumps or beads, which do not develop 

 beyond very small points. 



It does not liquefy gelatin. 



Upon plates of nutrient agar-agar the colonies appear 

 as small, almost transparent, round points, which have 

 about the same color and appearance as a drop of egg- 

 albumin ; they are very slightly opaque. They are 

 moist and glistening. They rarely develop to an extent 

 exceeding 1 to 2 mm. in diameter. 



Upon agar-agar as stab- or slant-cultures the surface- 

 growth has more or less of a mucoid appearance. It 

 is moist, glistening, and irregularly outlined. The out- 

 line of the growth depends upon the moisture of the 

 agar-agar. It is slightly elevated above the surface of 

 the medium. 



In contradistinction to the gelatin stab-cultures, the 

 growth in agar-agar is continuous along the track of 

 the needle. 



The growth on potato is a thick, irregular, slimy- 

 looking patch. 



The transparent mucilaginous substance which is seen 

 to surround these organisms renders them coherent, so 

 that efforts to take up a portion of a colony from the 

 agar-agar or potato cultures result usually in drawing 

 out fine, silky threads, consisting of organisms imbedded 

 in the mucoid material. 



The organism grows best at from 35° to 38° C, but 

 can be cultivated at the ordinary room-temperature — 

 about 20° C. 



The growth under all conditions is slow. 



It grows both in the presence of and without oxygen. 



It is not motile. 



It stains readily with all the ordinary aniline dyes. 



