42 STORRS AGRICULTURAL EXPERIMENT STATION. 


Gelatin stab; slight needle growth, but a moderately thick, white surface 
growth, which later becomes dry, with a slight yellow tinge. 
Agar, the agar develops on the surface a very decidedly lemon yellow 
growth, which is thick and abundant. The agar may, at the same time, be 
turned gveen, but not universally so. 
Potato; growth thin and moist, but lemon yellow. 
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Bouillon, slightly cloudy, and with a slight tinge of green near the surface. 
Milk; no effect upon milk at any temperature. Butter made from cream 
ripened with this species has no special flavor or aroma. 
No. 149. (Common.) JB. citreus lactis J, (n. sp.) 
Morphology; a rod, size, Iu by .7“, with rounded ends. On potato and agar 
the rods are connected with a slimy capsule. 
Gelatin plate; a minute colony, I mm., or a little larger. On the surface 
there is frequently produced a raised bead, with a central dot. The color is 
lemon yellow, brilliant, and even under the microscope the colonies appear 
brilliant lemon yellow, smooth and clear. 
Gelatin stab; needle growth moderate to the bottom of the tube. A rough 
surface growth, rather.thick, but not opaque. 
Agar, a thin, moist, transparent lemon yellow growth. 
Potato, a moderately thick, brilliant lemon yellow growth. 
Milk; no effect is produced on milk or upon cream. 
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While quite similar to No. 105, this species differs in its gelatin colony and 
its zxtense lemon yellow pigment, It is quite common in milk. 
No. 161. B. cttreus lactis If, (n. sp.) 
This organism agrees with the last described in all respects, except two. 
First, it liquefies gelatin slowly, producing a dense yellow liquid in the gelatin 
stab. Second, associated with this characteristic it is found that it curdles 
milk, producing a weak alkaline curd at ordinary room temperature. 
These two organisms are apparently the same species, differing in the power 
of liquefying gelatin, and consequently curdling milk. 
Both No. 149 and No. 161 have been found quite commonly in the milk in 
this vicinity, and in one case both of these types have been isolated from a 
single colony. 
No. 187. (Rare.) 
Morphology; a rod, size, .84 by 14 to 1.24. No chains, spores nor capsules. 
Gelatin plate; a round, semi-opaque, slightly yellow colony preenes: with 
no characteristic features. 
Gelatin stab; a moderate needle growth, with a slightly raised surface 
growth. Faint yellow, but not characteristic. 
Agar; a moist, smooth, glistening, lemon yellow growth. 
Potato, an abundant, moist, glistening, lemon yellow growth. 
Milk, no effect upon milk or cream. 
This organism has no characteristic features, except the lemon yellow color 
which is produced on gelatin, agar and potato. I separate it from No. 149 
because of the very moderate pigment it produces. 

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