340 APPLIED BACTERIOLOGY 



Agar-Agar. — A whitish expansion is formed, the agar 

 Hbecoming dark brown in colour. 



Potatoes. — Forms yellowish-white cheese-like expansion, 

 the growth being restricted to the point of inoculation. 



Spirillum Metsclinikovi. — This organism was first observed 

 by Gamaleia in the intestines of fowls. It is pathogenic in 

 the case of fowls, pigeons, and guinea-pigs, but does not 

 affect mice. It very much resembles Koch's cholera 

 spirillum and the Finkler-Prior bacillus. In liquid medium 

 it gives rise to very long spirals, which are very motile ; 

 it gives the indol reaction, as does the cholera spirillum. 

 Cultural characters : 



Gelatine Plates. — Small white colonies form, which soon 

 give rise to cup-like depressions. 



Gelatine Tubes. — Liquefaction of the gelatine takes place 

 in the form of a funnel-like tube, the whole of the medium 

 eventually becoming liquefied. 



Agar-Agar. — A yellowish-white expansion is formed. 



Potatoes. — A dirty-white layer is formed. 



Bacillus Mesentericus Fuscus. — This organism is found in 

 the air, water, hay, on vegetables, etc. It is a short, motile 

 bacillus, which occurs in twos and fours. It forms small 

 spores. Cultural characters : 



Gelatine Plates. — Forms small round white colonies, 

 which show delicate, thread-like projections. The gelatine 

 is liquefied. 



Gelatine Tubes. — The medium is quickly liquefied in the 

 form of a funnel-like depression ; in the liquefied portion 

 are seen a number of grayish flocculent particles. 



Agar-Agar. — Forms a yellowish-brown expansion. 



Potatoes. — The surface becomes covered with a smooth 

 yellow expansion, which afterwards becomes wrinkled and 

 brown. 



