Bacterial Flora of the Semi -Desert Region of New Mexico. 237 



A u 



Morphology. — Medium sized micrococcus; single and in 

 pairs; involution forms are found in old potato cultures; 

 size, about 1 



Gelatin Plate. — Small colony with regular and clear-cut 

 outline; finely granular. No liquefaction. Surface colonies 

 larger than the deep seated ones. Color, salmon-pink. 



Gelatin Stab. — Good growth along needle-track, but more 

 abundant toward the surface. A salmon-pink surface growth 

 appears, which spreads with age. No liquefaction. Oxygen 

 is necessary to color production. 



Glucose Gelatin— Apparently no growth. No gas. 



Gelatin Slant. — Moderate growth which increases slowly 

 with age. Salmon-pink in color. ' Smooth, regular and shiny. 

 No liquefaction. 



Agar Slant. — Abundant growth, slightly irregular, moist, 

 smooth and shiny. Salmon-pink. Increases with age, the 

 edges becoming paler in color. 



Bouillon.— Uniform cloudiness. Quite a heavy pink pre- 

 cipitate gathers at the bottom. 



Glucose Bouillon. — No gas and no visible change in medium. 



Milk. — Shows a pink surface growth (slight) and also a 

 pink precipitate. No further change during month. 



Potato. — Exceedingly slight growth after two days; dries 

 up without further increase. Characteristic salmon-pink 

 color. If kept in moist chamber, the growth proceeds slowly, 

 but becomes abundant and granular and shows the typical 

 salmon-pink color. The potato is slightly darkened. 



. . A 2 . 



Morphology. — A medium-sized coccus; single, pairs and 

 fours; size, 1 to 1.2 /j.. 



Gelatin Plate. — Colony begins as a small, round, smooth 

 pin-head growth which increases slowly in size. Color, sul- 

 phur-yellow. No liquefaction. 



Gelatin Stab. — Moderately abundant growth about equal 

 along entire track. After some days a slight surface growth 

 appears, which ultimately becomes quite abundant and shows 

 the characteristic sulphur-yellow color. No liquefaction. 



27 



