CLASSIFICATION OF DAIRY BACTERIA. dia uy! 
Bre LIQUERYING COCCI.—-STREPTOCOCCl AND MICROCOCEI. 
I. No acidity produced in dextrose or other sugars. 
M, lactis erythrogenes Grotenfelt n.s. A pink, fluorescent coccus. Several 
specimens of a micrococcus giving a pink fluorescence have been found. We 
haye given them the above name, although in our cultures they do not render 
milk red. As studied in our laboratary their characters are as follows: 
Morphology.—Size, .84. No chains. 
Gelatine colony. 

A smooth, flat colony, .5 mm. in diameter in four days, 
which later sinks into a shallow pit. 
_ Gelatine stab.—A white needle growth, with a slow liquefaction and a dense 
scum, stratiform. 
Agar streak.—A \uxuriant, white to yellowish growth, witha pink fluorescence. 
Fermentation tubes. No acidity and no gas. 
Bouillon,—A sediment and a turbidity formed, but no pellicle. 
Milk.—Rendered slightly acid and digested into a semi-transparent yellowish 
liquid; not curdled. 
Potato.—A luxuriant, yellow, moist growth. 
Grows at both 20° and 37°. Aerobic. 
This organism is clearly allied to B. lactis erythrogenes if it is not identical 
with it. 
M. lactis rubidusn.s. A red coccus, This organism has not been found 
since its previous description. It resembles J/. cinnabarius of Fliigge, differ- 
ing from it in the points shown in brackets. The following is the description 
of our organism as given in our previous publication: 
Morphology.—Size, 4. No chains. 
Gelatine colony.—A rapidly liquefying, red colony. Some of the colonies on 
the same plate are not red. [Dull red color. ] 
Gelatine stab.—Infundibuliform growth, which later liquefies completely, 
forming a red liquid. [Liquefaction only partial. | 
Agar streak.—A thick, moist, blood-red growth. [Yellowish brick-red. | 
Bouillon.—A sediment and turbidity, but no pellicle; the sediment is pinkish. 
Milk.—No change in the action. Old cultures show a digestion with a 
pinkish surface. 
Potato.—A very luxuriant, blood-red growth [yellow to red] spreading over 
the potato. 
Grows at both 20° and 37°. Produces no pigment at the latter temperature. 
Aerobic. 
While this organism is quite similar to Fligge, his is too insufficiently 
described to be sure of the identity. . 
M. lactis citronus n.s. An orange-colored, liquefying Micrococcus. This 
was found in the red slime on Camembert cheese. 
Morphology.—Size, .8u-.9gu. Gram stain irregular; no chains. 
Gelatine colony.—A yellowish, slowly-liquefying colony, with a clear liquid. 
Litmus gelatine is reddish-brown in color. 
Gelatine stab,—Liquefaction begins in four days and is never complete. 
Stratiform. 
