CLASSIFICATION OF DAIRY BACTERIA. Las 
Sar, lactis aurantiaca n. ». An orange, ligquefying Sarcina, This may be 
the same as the last, but its color is quite different and it shows some other 
differences. Probably Sar. aurantiaca of Fligge. 
Morphology.—Size, 1m. Gram stain positive, non-motile. 
Gelatine colony.—A liquefying pit, forms with an orange pigment. Litmus 
gelatine is not acid. 
Gelatine stab.—A slow liquefaction, stratiform. 
Agar streak,—Filiform, raised, smooth, moist, orange, luxuriant, slightly 
viscous. 
Fermentation tubes.—No acidity, no gas, no closed arm growth in any sugar 
bouillon. 
Bouillon.—A sediment, a membranous pellicle and a slight flocculent sedi- 
ment. 
Milk, No change in reaction, or a slight alkalinity; the milk is curdled and 
digested. Digestion is nearly complete, with an orange sediment. 
Potato,—Spreading, capitate, contoured, orange color, luxuriant; potato dis- 
colored. 
Grows at both 20° and 37° —_ Aerobic. 
Sar. lactis acidin. ». An acid, yellow Sarcina. 
Morphology.—Size, .8u-14. Gram stain positive; not motile. 
Gelatine colony.—Round, raised, smooth, homogeneous, opaque, brownish, 
slowly liquefying. 
Gelatine stab.—Liquefaction very slow and sometimes only a dry pit is 
formed, with a yellow bacterial growth. 
Agar streak.—Filiform, raised, smooth, cream-white, moist, not very luxuri- 
ant. Color is sometimes yellow. 
Fermentation tubes.—Acidity produced in all three sugar bouillons (it may be 
lacking in saccharose), but there is no gas nor closed arm growth. 
Bouillon.—A sediment and a slight turbidity, but no pellicle. (Turbidity 
sometimes absent.) : 
Milk,—Becomes acid, but does not curdle or digest. 
Potato.—Toes not grow well, but there is a slight cream-colored growth. 
Grows at both 20° and 37°, though not very abundantly at 37° ‘Aerobic. 
THE GENUS BACTERIUM, NON-LIQUEFYING, 
I. No acid in dextrose or other sugars. 
Bact. lactis salmonis n.s. A salmon-colored Bacterium. 
Morphology.—Size, .64x 1¢-1.84, forming chains. Gram stain is positive and 
there are no spores nor capsules. 
Gelatine colony.—Round, umbonate, contoured, lobed, white. Litmus gelatine 
colonies are strongly alkaline and transparent. 
Gelatine stab,—Needle growth and a raised surface growth. 
Agar streak,—Filiform, thin, smooth, white to yellow, and later a salmon or 
pink color. 
Fermentation tubes.—No acidity, gas, nor closed arm growth in any sugar 
bouillon. 
