130 STORRS AGRICULTURAL EXPERIMENT STATION. 
Fermentation tubes.—Acidity and closed arm growth in all sugar bouillons, 
but no gas. 
Bouillon.—A sediment and slight turbidity, but no pellicle. 
Milk,—Becomes acid and curdles promptly at both 20° and 37°. A rusty 
precipitate appears in some cultures. 
Potato.—Scanty, reddish-brown color (originally showing yellowish colonies 
that become red). 
Grows at both 20° and 37°. Facultative anaerobic. 
If this colorless variety should be met incidentally in milk, it would never be 
thought to be Bact. rudensis, and would doubtless be placed with Bact. /actis 
acidi group, and perhaps be regarded as identical with that organism. ‘This 
raises the question naturally whether other members of that group may not be 
albino types of pigment-producing bacteria. So far as we know we have never 
found this species, although we have no proof that some of our white types are 
not such albino varieties. 
Bact, lactis catenensisn.s. Yellow spore-bearing Bacterium. 
Morphology.—Size, .7u x 1.2u; producing chains. Gram stain is negative, 
and small spores are produced. In old cultures the rods may be much smaller, 
5 be 
Gelatine colony.—Round, raised, smooth, homogeneous, transparent, and of a 
yellow to white color. On ¢mzs gelatine the color is yellow to gray, not acid. 
Gelatine stab,—A good needle growth, and a flat orange-yellow surface. 
Agar streak. —Orange to yeliow, thin, and sometimes wrinkled. 
Fermentation tubes.—Dextrose and lactose acid, saccharose not acid. No gas 
or closed arm growth. 
Bouillon.—A sediment, turbidity, and a pellicle. 
Milk.—No effect, as a rule, but one culture curdled milk, acid at 37°. 
Potato,—Luxuriant, wrinkled, orange-yellow. 
Grows at 20° and 37°, but better at 20°. Aerobic. 
Three cultures of this general type have been studied from Middletown, 
Cromwell and New York. The first was orange, the second lemon-yellow, and 
the third brown-orange on agar, and white on potato and gelatine. The last 
did not show a wrinkled growth on agar, although it did on potato. 
Bact, lactis aureum I], n.s. An orange, acid-forming Bacterium, 
Morphology.—Size, .8u-1.2ux 1,2u-1.84. No chains, no spores. Gram stain 
negative. 
Gelatine colony.—Round, convex, smooth, entire, orange-yellow. On tmus 
gelatine it is thin and not acid. 
Gelatine stab.—A needle growth and a thin surface growth. 
Agar streak.—Moderately luxuriant, filiform, thin, smooth, orange color, 
moist. 
