

BACTERIA IN THE-DAIRY. 79 
Gelatine Stab Culture.—A beaded needle track with an abundant growth. A 
raised, transparent surface layer which thickens into a quite thick white mass. 
Agar-Agar.—A very thin, transparent, extremely tenacious yellow layer 
which adheres to the needle and is not easily spread or diffused through water. 
Potato.—No visible growth. 
Milk.—No noticeable effect upon milk. After several weeks there is a slight 
acid reaction in the milk, but not sufficient to curdle the milk when heated. 
Bouillon.—Liquid becomes uniformly cloudy with a dense, tough} yellowish 
sediment. After four weeks the liquid clears retaining the sediment. 
No. 44. 
Locality.—Milk from Uruguay. 
Morphology.—A large micrococcus 1.5 y. in diameter. 
Motiiity.—Non-motile. 
Relation to Air.—W ill grow under mica plate. 
Temperature.—Grows well at 35° and at 20°. 
Colony on Gelatine.—A smooth, round, raised gray colony. Sometimes there | 
is formed a whitish bead at first which spreads into a grayish colony of small size. 
Gelatine Stab Culture.--There is an abundant needle growth with a thin, 
transparent, slightly spreading surface growth. Sometimes in old cultures the 
surface is sunken into a dry pit. 
Agar-Agar.—A thin, whitish, dry iridescent growth, rather tough and not 
dissolving in water. 
_ Potato.-—A yellowish or slightly brown growth turning the potato dark colored. 
Milk.--N o change in the milk although after a couple of months’ growth the 
milk becomes rather thick and transparent. MJReaction is hardly affected. 
 Boutllon.—A uniformly cloudy liquid, especially cloudy at the surface, where 
there is a thick cloudy layer of considerable depth, but no true scum. After 
four weeks the liquid is still cloudy with a slight scum. 
INGwAS. 
Locality.—From Chicago. Isolated from a lot of fermented milk (Matzoon). 
The milk had a pure, clean, sour taste and a fine curd. 
Morphology.—A species of Sarcinnia, .7 » in diameter. 
Motility.— Non-motile. 
Relation to Air.—Grows under mica plate. 
Temperature.—Grows abundantly at 35°, producing abundant culture. Grows 
well at 20°. 
Colony on Gelatine.—A large, slightly sunken colony, with a nucleus and 
granular edge. 
— Gelatine Stab Culture.—Slight growth along needle track, forming a yellowish 
dry layer on the surface of the gelatine. 
Agar-Agar.—A bright, yellow raised layer with sharp edges and not very 
diffusely spreading. 
Potato.—Very slight growth on potato, with a slight yellowish tinge. 
Milk.—No effect on milk at any temperature. 
Bouillon.—The liquid remains clear, but a sediment appears and also flakes 
arise on the sides of the tubes. These flakes continue to make their appearance 
and sink to the bottom for some time. After four weeks the liquid is clear, with 
a distinct sediment. 
