I 2O BACTERIOLOGY. 



* 



minute quantity of a pure cultivation die in two 

 to ten days, and the groups of the characteristic 

 tetrads may be found in the capillaries through- 

 out the body, especially in the spleen, lung, and 

 kidney (Plate XII., Fig. i). 



Double infection can be produced by inoculating 

 a mouse with a pure cultivation of bacillus 

 anthracis two or three days after inoculation 

 with micrococcus tetragonus. On examination 

 after death the capillaries of the lungs, liver, 

 and kidney are filled with both anthrax bacilli 

 and masses of tetrads* (Plate XVI., Fig. 2). 



Genus III. Sarcina. 



Sarcina ventriculi, Goodsir.f Cocci reach- 

 ing 4 p. in diam., united in groups of four, or 

 multiples of four, producing cubes or packets with 

 rounded-off corners. Contents of the cells are 

 greenish or yellowish-red. They occur in the 

 stomach of man and animals in health and disease, 

 and were first detected in vomit. 



Sarcina intestinalis, Zopf.J Cocci in groups of 

 four or eight. Very regular in form ; never in the 

 large packets which occur with Sarcina ventriculi. 

 They are found in the intestinal canal, especially the 

 caecum, of poultry, particularly fowls and turkeys. 



Sarcina lutea. Cocci singly, in pairs, in 



* Crookshank, Notes from a Bacteriolog. Laboratory. Lancet, 

 1885. 



t Edinburgh Med. and Surg. Journal. 1842. 

 I Zopf, Die Spaltyilze. 1885. 



