MICROSPIRA METCHNIKOVI. 



503 



The whole growth is so smooth and glistening that it 

 has somewhat the appearance of being varnished. 



In bouillon it quickly causes opacity, with the ulti- 

 mate production of a delicate pellicle upon the surface. 



FIG. 80. 





a b c d 



Stab-culture of microspira Metchnikovi in gelatin, at 18 to 20 C. 



a. After twenty-four hours, b. After forty-eight hours, c. After seventy-two 

 hours, d. After ninety-six hours. 



It causes liquefaction of blood-serum, the liquefied 

 area being covered by a dense, wrinkled pellicle. 



When grown in peptone solution it produces indol 

 and coincidently nitrites, so that the rose-colored reac- 

 tion characteristic of indol is obtained by the addi- 



