I40 STORRS AGRICULTURAL EXPERIMENT STATION. 
Bact, lactis rubrum. Non spore-bearing, pink Bacterium, This has not been 
found since its original description in 1899. Its characters, as then given, are 
as follows: 
Morphology.—Size, 2u-44x.gu. Forming chains. No spores, no capsule. 
Gelatine colony.—A bead-formed colony, .7 mm. in diameter, with a granular 
edge. Liquefies with a nucleus and a clear zone. 
Gelatine stab. A slow liquefier, stratiform, producing a clear liquid with a 
scum and a sediment. 
Agar streak.—Luxuriant, wrinkled, dull orange-yellow or pinkish. 
Bouillon.—A sediment, but no pellicle nor turbidity. : 
Milk.—Becomes alkaline and curdles after several days at 37°. It digests 
into a dirty liquid. 
Potato,—Glistening, smooth, pink or salmon-qolored, luxuriant. 
Grows at both 20° and 37°. 
Variety A.—Found later. Agrees with the above, except that it is of an 
orange rather than a pink color. 
Bact. lactis Burrin. >. A reddish, bitter milk organism, described by Burr 
and Dugelli. As described by them its characters are as follows: (Cent. f. 
Bac, II., XV., p. 709.) 
Morphology.—Size, tu-34x.74. Nochains; no spores. Gram stain nega- 
tive. 
Gelatine colony.—Surface colony in a liquefying area, 4g mm. in diameter. 
In fourteen days it is 4% mm. in diameter, of a clear brown color. 
Gelatine stab.—Begins to liquefy,in four days; infundibuliform. 
Agar streak.—Luxuriant, smooth, lobed, reddish. 
Fermentation tubes.—No acidity, gas, nor closed arm growth. 
Bouillon.—A turbidity, but no sediment nor pellicle. 
Adilk.— Becomes acid, but does not curdle or digest. It becomes a rusty 
red, with a cheesy smell and, later, a bitter taste. 
Potato.—No growth. 
Grows at 20° but not at 37°. Aerobic. 
Bact. lactis citronisn. s. A non spore-bearing, lemon-yellow Bacterium. 
Morphology.—Size, 1x .6u, forming chains. No spores are produced, and 
no capsules. 
Gelatine colony.—Small pits are produced, with a nucleus and a lighter outer 
zone, which may be variously streaked. 
Gelatine stab.—A slow liquefier, producing a cratiform liquefaction, with a 
dense sediment and a yellow liquid. At first clear, but later cloudy. 
Agar streak.—A luxuriant, thick, folded growth, at first greenish-yellow, and 
later lemon-yellow. 
Bouillon.—A turbidity and a sediment. 
Milk.—Becomes alkaline and digested into an amber-colored or pale yellow 
liquid. Sometimes it curdles before digestion. 
Potato.—Thick, smooth, flesh-colored, and later lemon-yellow; or sometimes 
lemon-yellow from the start. 
Grows at both 20° and 37°. Aerobic. 
