138 STORRS AGRICULTURAL EXPERIMENT STATION. 
Gelatine stab,—Liquefies, stratiform, with a tough, white, mold-like skin, 
and, later, with a complete liquefaction and a yellowish scum. The rapidity of 
liquefaction is very different in our two cultures. 
Agar streak.—A luxuriant, whitish-yellow, rough growth, with an irregular, 
lobate or feathery edge. ; 
Bouilton.—A tough, felted scum, without turbidity or sediment. 
Milk.—Rendered alkaline, curdled in three days, and digested, showing a 
thick, folded scum. In twelve days a translucent surface with a curd below. 
Potato.—Luxuriant, white, velvety or powdery dry growth. 
Grows at 20° and 37°. Aerobic. 
\ 
Bact. lactis Michiganii n. s. A white, spore-bearing Bacterium. This 
organism, sent by Marshall, does not agree with any that we have found, 
although closely allied to the last. The most striking difference is in the colony, 
but this may be due to the greater vigor of liquefaction. At present, however, 
we keep it as distinct. 
Morphology.—Size, 1.84x.94, forming chains. Spores developed. Gram 
stain negative. 
Gelatine Colony.—A rapidly liqwefying colony, with a uniformly cloudy 
liquid. 
Gelatine stab.—Needle growth beginning to liquefy in one day, infundibuli- 
form; liquefaction complete in three days. 
Agar streak,—Spreading widely, moderately thick, wrinkled, opaque, white, 
not luxuriant. , 
Fermentation tubes.—No acidity, no gas, no closed arm growth. 
Bouillon.—A sediment, turbidity, and a wrinkled pellicle. 
Milk.—Alkaline, curdled and completely digested. At 37° slightly pinkish, 
but not at 20°. 
Potato. — Luxuriant, filiform, thick, alveolate, opaque, gray-brown, dry, 
wrinkled. g 
Grows better at 37” than at 20°. Aerobic. 
Bact. lactis Genevum ns. A white, spore-bearing Bacterium, sent us by 
Harding. 
Morphology.—Size, 34-84 x 1.44. No chains. Spores formed chiefly at the 
ends of the rods. Rods with square ends. Gram stain positive. (One culture 
negative.) 
Gelatine Colony.—A rapidly liquefying colony that may be a smooth liquid 
mass or may be cloudy. On “tmus gelatine there may be a wrinkled film. 
Colony not acid. 
Gelatine stah.—A needle growth and a stratiform liquefaction, beginning in 
one to three days. 
Agar streak.—Spreading, thin or raised, smooth, whitish or creamy, moist or 
sometimes dull, luxuriant. 
Fermentation tubes.—No acidity or gas in any sugar bouillon; closed arm 
growth usually seen. (A slight acidity may appear for a day or two in dextrose, 
but it then disappears.) 
Bouillon.—A sediment, turbidity and pellicle. 
