154 STORRS AGRICULTURAL EXPERIMENT STATION. 
Milk.—Is curdled without change in the reaction, or slightly alkaline, and is 
afterwards digested. After digestion it is colorless and transparent, and some- 
times jelly-like. It may have a greenish tinge. 
Potato.—A luxuriant growth, widely spreading, convex, smooth and moist, of 
a brownish color. Potato not discolored. 
Grows at both 20° and 37° _— Aerobic. 
Probably the culture that produces the green color deserves to be called a 
distinct variety. 
Ps. lactis Eurotasn.s. A brown, fluorescent, liguefying Pseudomonas. 
This organism has been found in milk directly from the udder and in New 
York city milk, the latter differing from our organism in the points indicated by 
brackets. 
Morphology.—Size, .gu-1.54 x .34. No chains, no spores, no capsules, and 
Gram stain negative. 
Gelatine colony.—A round, convex, smooth, punctate, entire colony, of a 
gray-brown color. On Atmus gelatine it is alkaline and slowly liquefies. 
Gelatine stab.—Liquefaction is slow; stratiform. 
Agar streak,—A \axuriant growth, linear, flat, smooth, gray [yellow], moist. 
The agar shows an amber-colored fluorescence. 
Fermentation tubes.—All three bouillons are rendered alkaline, and show 
closed arm growth, but no gas. 
Bouillon.—A sediment, a decided turbidity, and a flocculent pellicle. 
Afilk.—\s rendered alkaline, is curdled both at 20° and 37°, and is completely 
digested. [The milk does not curdle.] 
Potato.—A luxuriant, linear, smooth growth, of a brown color [yellowish]. 
Grows at both 20° and 37°. Facultative anaerobic. 
Ps. lactis nigra Gorini. A black pigment forming Pseudomonas. This organ- 
ism was received from Gorini, and the characters as given below were determined 
by him. It clearly resembles 2B. lactis niger A. 
Morphology.—Size, 2u-3.54x Iu. No chains, no spores, no capsules. Gram 
stain negative. 
Gelatine colony.—A pit, liquefying slowly, and with an irregular centre. 
Gelatine stab.—Liquefaction begins in twelve hours; infundibuliform. 
Ayar streak.—A filiform, raised, rugose growth; opaque, cream-white. 
Luxuriant, with a dull surface, and sometimes wrinkled. The agar shows a 
brown fluorescence. 
Fermentation tubes.—No acidity nor gas in any sugar bouillon. A very slight 
growth in the lower quarter of the closed arm. 
Bouillon.—A sediment and slight turbidity, with a wrinkled pellicle, which 
may sink in flakes to the bottom. 
Mitk.—Rendéered acid, curdled, and subsequently digested. The digestion 
is complete and a slight sliminess is produced. 
