CLASSIFICATION OF DAIRY BACTERIA. 143 
Morphology.—A rod, formingno chains. Size, 1.24x.84. No spores no 
capsules. Gram stain positive. 
Gelatine colony.—A slowly liquefying colony, with a dense central growth 
and aclear liquid. 
Gelatine stab,— A slow liquefaction; crateriform. 
Agar streak,—A luxuriant, filiform, raised, rugose, lemon-yellow growth; 
dull and wrinkled. 
Fermentation tubes,—No gas, no acidity, and no closed arm growth in any 
, bouillon, 
Boutllon.—A sediment, membranous pellicle and a slight turbidity. 
Milk.—Becomes alkaline, but no other visible change. 
Potato.—A luxuriant, spreading, thick, contoured growth, opaque, white or 
brownish-yellow. : 
Grows at 20° and 37°. Aerobic. 
The color of this organism varies from a brilliant yellow to a dull yellow. 
Some cultures do not appear to grow on potato and show a slight digestion of 
milk. 
Variety A.—One culture we regard as distinct enough to be recognized as a 
variety. It was obtained from milk rather thanfromcheese. Its size is 84x .34, 
and it does not stain with Gram. Its colony is round, moderately thick, smooth 
and yellow, and then forming a pit. Upon Xtmus gelatine it is pale and thin. 
It produces no pellicle on bouillon, but curdles and digests milk, turning it 
slightly yellow. Its growth on potato is dry, luxuriant and lemon-yellow. 
Bact, lactis Ashtoniin. s. A non spore-bearing, yellow Bacterium. 
Morphology.—Size, 1.2u-3.5@x 1.24. No chains, no spores nor capsules. 
Gram stain irregular. 
Gelatine colony.—A slow, liquefying pit, with a cloudy liquid, tinged with 
yellow, Atmus gelatine is not acid. 
Gelatine stab.—A needle growth and a napiform liquefaction, beginning in 
three days. 
Agar streak.—Filiform, raised, smooth, yellow, moist, viscous. 
Fermentation tubes.—No acidity or gas in any bouillon, closed arm growth in 
all. (Saccharose is slightly acid after several days.) 
Bouillon.—Sediment, turbidity and pellicle. 
Milk.—Is rendered alkaline, curdled and digested completely, with a yellowish 
surface and a strong odor. 
Potato.—Filiform raised, smooth, yellow, luxuriant; no discoloration. 
Grows at 20° better than at 37°. Facultative anerobic, 
Bact, lactis album n. >. A white, liquefying Bacterium, not acid. Found in 
the udder at Storrs. It may be the same as Bact. /uteum, without pigment. Its 
characters are as follows: : 
Morphology.—Rods, forming no chains. Size, Iu-3ux .7u-.gu. It forms no 
spores, no capsules, and Gram stain is positive. 
