I06 BACTERIOLOGY 



Gelatin stab. In depth a good growth ; on the surface growth colorless, be- 

 coming in 3-4 days round, pink, depressed. In 3 weeks one-half of the 

 gelatin is liquefied, with a pink sediment. 



Agar slant. Growth soft, dark pink. 



Potato. In 3-4 days a cherry-red streak becoming spreading, and darker, like 

 B. prodigiosus. 



Habitat. Isolated from sputum of an influenza patient. 



83. M. coralinus Centanni 



Centralblatt f. Bakteriologie, XXIII, 1898, 308. 



Morphology. From blood-agar cultures, rather large, round, in twos, threes, 

 tetrads, and clumps. Stain by Gram's method. Aerobic. On media at 

 room temperatures grow slowly; grow best on Viiges blood-agar. No 

 growth at 37° C. Optimum temperature 20°-25° C. 



Blood-agar colonies. In 48 hours small points, becoming in 6 days confluent, 

 dark coral-red ; agar not stained. 



Agar slant. Growth slight ; very small white colonies, becoming a delicate 

 layer, becoming in 10 days rose-red. 



Gelatin. Slight growth ; coral-red colonies, with slow liquefaction after 20-25 

 days. 



Gelatin stab. In depth but slight or no growth ; on the surface a small coral- 

 red colony ; gelatin liquefied after many days. Grow well on Capaldi's 

 egg-agar. On milk agar a soft white growth, becoming rose-red. 



Bouillon. Slight growth ; in 15-20 days medium a slight red — rose-red ; clear. 

 Grow better on addition of glucose. 



Milk. Not coagulated, becoming in 15-20 days yellowish red ; the cream layer 

 remains white. 



Potato. Slight growth ; in 20-30 days rounded colonies of a dark carmine 

 color. Pigment: Only slightly soluble in water and alcohol. 



Pathogenesis. Rabbits and guinea pigs die in 4-5 days, with toxic symptoms 

 and emaciation ; at the point of inoculation a slight infiltration of a red- 

 dish color. 



Habitat. Isolated from a contaminated plate culture. 



84. M, Dantecii 



Micrococcus Danteci: Annates Pasteur Institut, 1891, 659. 



Morphology. Cocci 3.0-5.0 \x., often with a fission line. 

 Gelatin colonies. Surfcue : Small, disk-shaped, red ; grow slowly, ± i mm. 

 Gelatin stab. In depth, a slight yellowish growth ; on the surface, light 

 red, becoming later deep red. 



