
CLASSIFICATION OF DAIRY BACTERIA. 43 
No. 141. (Rather common.) 
Morphology, a bacillus, size, .6u by tm to 2u, 
Gelatin plate; the deeper colonies are round, brown and opaque. Surface 
colony is more transparent, whitish and finely and uniformly granular. 
Gelatin stab; a moderate needle growth, with a dry, white, spreading surface 
growth. Moderately thick. Somewhat irregular edges. 
Agar, a thick, moist growth, which is at first white, with a tinge of yellow, 
later becoming lemon yellow. 
Potato, coarse or fine folded skin, with a yellow color. 
Milk; no effect produced on milk or cream. 
No. 162. 
This agrees with No. 141 in all respects, except that the growth on potato is 
very scanty, and there is scarcely any growth in bouillon. The two probably 
are the same. 
No. 191. (Rare.) B. citreus arborescens. (n. sp.) 
Morphology; a rod, size, .84 by 44. Two or three may adhere together, but 
no long chains. Is joined by a capsule that does not stain. 
Gelatin plate; a widely spreading colony, with fize radiating rods growing 
from the center, and some growing over the whole plate, with fiber permeating 
the gelatin in every direction. TZ%ese fibers have frequent knobs, The fibers 
from two colonies will extend over a whole plate in three days. To the naked 
eye they look like a mould. This growth is very characteristic. 
Gelatin stab; needle growth is slight, but a thick ground glass surface 
growth is produced. 
Agar; white, moist and irregular, spreading in streaks over the surface. 
Potato; dry and thin, but lemon yellow in color. 
Milk; no effect, except a slight transparency and an alkaline reaction. 
GROUP V. NON-LIQUEFYING COCCI, NOT CHROMOGENIC. 
Division A. 
Organisms which curdle milk with an acid reaction, 
No. 60. (Very common.) 4. actdi lactict 7. (Marpmann.) 
Morphology; a coccus, .6u in diameter, growing in masses. 
Gelatin plate; forms rounded beads, finely granular, but with a smooth edge, 
and not characteristic. 
Gelatin stab; moderate needle growth, rough and beaded. ‘The surface is 
rough and irregular, moderately thick. 
Agar; an opaque, white growth, which may grow down into the agar from the 
needle track, later becoming Naples yellow. 
Potato; white, somewhat thick and spreading, and later becoming yellow. 
Milk; at 20° is rendered acid, but not curdled, though such milk will curdle 
when boiled. At 35° is curdled into a hard curd which is aczd. Cream is 
slightly thickened, rendered acid and sour. Butter made from the same has a 
decidedly good flavor, but practically no aroma. 
