CLASSIFICATION OF DAIRY BACTERIA. 143 
Morphology.—A rod, forming no chains. Size, 1.24x.84. No spores no 
capsules. Gram stain positive. 
Gelatine colony.—A slowly liquefying colony, with a dense central growth 
and a clear 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, 
Bouillon.—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. Itssize is .8ux .3u, 
and it does not stain with Gram. Its colony is round, moderately thick, smooth 
and yellow, and then forming a pit. Upon &tmus 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. lactts Ashtonitn. s. A non spore-bearing, yellow Bacterium, 
Morphology.—Size, 1.2¢é-3.5u4¥x 1.24. No aie no spores nor ease 
- Gram stain irregular. 
Gelatine colony.—A slow, liquefying pit, with a cloudy liquid, ated with 
yellow, Aimus 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.) 
Boutllon.—Sediment, turbidity and pellicle. 
Mitk.—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. s. A white, iquefying Bactertum, not acid. Found in 
the udder at Storrs. It may be the same as Bact. luteum, without Rigen Its 
characters are as follows: 
Morphology.—ods, forming no chains. Size, Iu-3u4x.7u-.gu. It forms no 
spores, no capsules, and Gram stain is positive. 
