120 STORRS AGRICULTURAL EXPERIMENT STATION. 
The white liquefying cocci are very numerous and we have studied many 
separate cultures of them. Whether they should all be grouped together is un- 
certain. We have endeavored to arrange them in sub-groups, as shown below, 
but are convinced that these represent only physiological varieties of the same 
type. Weare also of the opinion that this group is simply a liquefying form 
of the white coccus, Gal. versicolor. (See p. 110.) : 
M. lactis albus n. ». 
Morphology.—Size, .7u-1". Gram stain is positive; no chains. 
Gelatine colony.—Round, moderately luxuriant, thick, smooth colonies, which 
may liquefy or in some cultures do not liquefy. In Utmus gelatine the colony is 
dense and alkaline. 
Gelatine stab.—A very slow liquefier, that commonly forms a dry pit with a 
white growth on its sides. 
Agar streak.—Moderately luxuriant, opaque, whitish. 
Fermentation tubes.—No acidity, gas, or closed arm growth in any sugar 
bouillon. : 
Bouillon.—A very slight growth, showing a slight turbidity and a sediment 
but no pellicle. 
Milk.—Rendered alkaline and digested without curdling. Later the milk 
becomes pinkish and slimy. 
Potato,—Luxuriant, thick white. 
Grows at 20° and 37°. Aerobic. 
Variety A.—Shows a viscosity on agar and sliminess in milk. 
Variety B.—Shows no viscosity; a wrinkled growth on agar; a pellicle on 
bouillon and a discolored potato. Milk is curdled at 37°. 
Variety C.—Has a moruloid colony that slowly liquefies, produces a pellicle 
on bouillon, and no milk digestion. 
Variety D.—Liquefies more rapidly and curdles milk. 
Variety E.—A very large coccus, 24 in diameter. 
Variety F.—A very slow liquefier, curdling and digesting milk; the milk 
after some weeks turning to a dark mahogany color. Potato growth is dry and 
velvety. < 
To this same group belong doubtless the small coccus 4. of Freudenreich. 
II. Acid in dextrose or other sugars. 
M., lactis fluorescens n.s. Only one fluorescens coccus has been found, in 
stable dust. 
Morphology.—Size, .5u-.6u. Gram stain negative, 
Gelatine colony.—A round, moderately thick, smooth, entire colony, with a 
greenish liquefaction. Litmus gelatine shows liquefying pit that is not acid, 
‘Gelatine stab.—A stratiform liquefaction. 
Agar streak.—A luxuriant, narrow, rather thick, smooth, white growth, with 
a green fluorescence. 
Fermentation tubes.—Dextrose is rendered acid, the other sugars alkaline: no 
gas is produced. Growth appears in closed arm. 
Bouillon.—A sediment, turbidity, and pellicle. 
