

CLASSIFICATION OF DAIRY BACTERIA. 61 
No. 145. (Rare.) 
Morphology; size, 14 by 3.54, blunt ends. Long chains occasionally pro- 
duced. Spores spherical. 
Gelatin plate; colony liquefies when it reaches the size of 1 mm., forming a 
dense, white layer, covering the whole surface of the liquefying pit. 
Gelatin stab, liquefies at first as a small cone, and this slowly spreads over 
the whole surface, becoming covered with a dense, white film. 
Agar, not characteristic, 
Potato, very thick, dirty white layer, slightly transparent and gelatinous. 
Milk, no effect upon milk either at 20° or 35°. 
No, 114. (Rare.) B&B. mesentericus fuscus. 
Morphology; size, .8u by 2u, forming long chains. 
Gelatin plate; deep colonies are round, smooth and transparent. ‘The sur- 
face colonies are raised, with a thin, transparent edge and irregular rim, creep- 
ing over the surface in irregular lobes. In five days it reaches the size of 
I mm., then it sinks into a liquefying pit, the colony remaining as a dense 
growth over the whole surface, with no clear liquid ring surrounding it. 
Gelatin stab; needle growth abundant. A very shallow pit, with an air 
bubble in its center. The pit later spreads over the whole surface. 
Agar, a somewhat dry, slightly folded growth. 
Potato, a gray or yellowish, thick, highly folded skin. 
Milk; at 20° does not curdle but digests slowly and becomes alkaline. At 
26° curdles in six days and digests. Cream ripened with this organism pro- 
duces butter with no aroma nor flavor.’ 
GROUP X. BACILLI WHICH LIQUEFY GELATIN AND FORM SPORES 
LARGER THAN RODS. 
These easily recognizable bacteria I divided into three divisions, according 
to the position of the spore. 
Division A. Spores in the middle of the rod (spindle formed). 
Division B. Spores at one end of the rod (tetanus type). 
Division C. Two spores (?), one at each end of the rods. 
Division A. . 
Spores tn the center of the rods. 
No, 128. (Rather common.) JB. arborescens lactis. (n. sp.) 
Morphology; size, 1.84 by 34, growing into long chains. Large spores 
produced of a size 1.24 by 2u, causing the rods to swell in the middle. 
Gelatin plate; colony grows into a large felted ground glass mass, which 
sinks slowly in a shallow pit. 
Gelatin stab; a thick, ground glass surface growth forms as a scum floating 
on a shallow funnel. This eventually becomes much folded. Later the whole 
becomes liquefied, and the scum remains folded and tenacious. 
Agar; grows into remarkably spreading branching filamentous masses which 
cover the whole surface and even grow under the surface. (Quite characteristic. 
Potato; almost snow white, abundant growth which extends into the potato. 
The surface is raised into folded mounds. 
