Orange- 

 coloured 

 sarcina. 



226 CLASSIFICATION OF THE MICRO-ORGANISMS. 



Sarcina aurantiaca. 



Observed in Koch's laboratory, and frequently employed 

 in disinfection experiments. (Mitth. a. d. Kais. Gcs. 

 Ami, vol. 2). On nutrient jelly it forms slowly grow- 

 ing orange yellow colonies with gradual liquefaction of 

 the gelatine. A more detailed description is wanting. 



Sarcina 

 ventriculi. 



Cultivation 

 experiments. 1 



Sarcina ventriculi. 



Discovered by Goodsir in 1842. Is found in the 

 contents of the stomach in man and animals, and 

 especially in the vomit ; is most frequently observed 

 in those cases where there are intense fermentative 

 processes favoured by retention of the contents of 

 the stomach ; colourless or yellowish brown, round or 

 slightly oval cells, with an average size of 2'5 /M., 

 united in groups of eight forming small cubes rounded 

 at the angles ; these are bound together to form larger 

 packets. 



Falkenheim has recently obtained cultivations of this 

 sarcina on gelatine plates ; they formed after 36 to 

 48 hours roundish, for the most part prominent, 

 colonies of a yellowish colour. On microscopical ex- 

 amination colourless spherical cocci 1*5 p. in diameter 

 were found in these cultivations, as well as numerous 

 diplococci and tetrads, but no cubical packets. Growth 

 also occurred on other nutritive media, potatoes, blood 

 serum, &c., but the arrangement of the cocci charac- 

 teristic of sarcinse was not present. On the other hand, 

 this arrangement was well marked in cultivations in 

 neutralised hay infusion, which showed after 24 hours 

 brownish flocculi and a scum consisting of small brownish 

 scales. In the scum as well as in the flocculent deposit 

 were numerous sarcina packets with a distinctly cubical 

 arrangement. On the addition to the hay infusion of 

 2 per cent, of cane or grape sugar growth was very 

 luxuriant. 



If the hay infusion was decolourised with animal 

 charcoal, and then a solution of litmus added, it became 



