178 STORRS AGRICULTURAL EXPERIMENT STATION. 
B. lactis amberisn. s. A brown fluorescent liquefying bacillus, Found only 
in milk from Colchester. 
Morphology.—Size, 1m-1.54x 3u-4ph. No chains, central spores, Gram stain 
is positive and a capsule is produced. ; 
Gelatine colony.—A non-characteristic, rapidly liquefying colony. 
Gelatine stab,— Liquefaction begins in one day, infundibuliform; complete in 
six days. 
Agar streak.—Linear, raised, rugose, translucent, yellowish, moist, wrinkled. 
The agar with an amber colored or yellow-green fluorescence. 
Fermentation tubes.—Dextrose is acid, the other two sugars alkaline. No 
gas, but a very slight growth in closed arm. 
Bouillon.—A flocculent sediment, a slight turbidity, but no pellicle. 
Milk.—No change in reaction. Curdled in one to two days, and digested 
both at 20° and 37°. Digestion is nearly complete in three weeks. 
Potato.—Linear, raised, smooth, yellowish, dry, luxuriant; potato discolored. 
Grows at 20° and 37°. Facultative anaerobic. 
The last two organisms are very closely related and may be identical. The 
amber colored fluorescence and the yellow pigment lead us to separate the two, 
B. mesentericus fuscusn.s. A brown, spore-bearing acid liguefier. Found 
only once in milk, directly from the udder. 
Morphology.—A peritrichic bacillus which does not form chains. Size, 1.24- 
I.5u¢x.4u-.6u. It stains by Gram method and produces central spores. 
Gelatine colony.—A round, convex; smooth, entire colony, of a brownish-red 
color. On Litmus gelatine it is acid. 
Gelatine stab,—A slow liquefaction, napiform. 
Agar streak.—Spreading, thin, rugose, translucent, gray, luxuriant, dull, and 
wrinkled, 
Fermentation tubes.—Dextrose and saccharose rendered acid, but no gas nor 
closed arm growth in any sugar bouillon. 
Bouillon,—A slight ‘turbidity is produced, although sometimes even this is 
wanting. No sediment, nor pellicle. 
Milk.—Rendered slightly alkaline, and curdles in six days at 37°. The milk 
is digested, although this power of digestion was lost after long cultivation. 
Potato.—A \uxuriant, spreading, thin, rugose growth, of a brown-red color, 
wrinkled. 
Grows better at 37° than at 20°. Aerobic. 
B. lactis vinusn. s. A spore-bearing, acid liguefier. This has been found 
but once, in milk in Middletown. 
Morphology.—1p-1.2p, x.64. No chains. Spores are produced, no capsules, 
and Gram stain is negative. 
Gelatine colony.—A very rapidly liquefying colony with a slight granular liquid. 
Not characteristic. 
