SYSTEMATIC AND DESCRIPTIVE. 2OQ 



found in gonorrhceal pus adhering to the pus 

 corpuscles and epithelial scales. Artificial cultiva- 

 tions have been carried out,^ and the pathogenic 

 character of the cocci established by inoculation. 



Micrococcus tetragonus. Cocci about i /x 

 in diam., in groups of four (tetrads), surrounded 

 by a hyaline capsule. They are found in the 

 sputa of phthisical patients and in the walls of 

 tubercular cavities. In a test-tubs of nutrient 

 gelatine they form an irregular white growth, more 

 especially in the upper part of the needle track 

 (Plate IV., Fig. i). On the sloping surface of 

 nutrient agar-agar thick, whitish, heaped-up masses 

 develop. Guinea-pigs and mice inoculated with a 

 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 t (Plate XVIL, Fig. 2). 



Micrococcus citreus conglomeratus, Bumm. 



* Bockhart, Sitzungsberichte der Phys. Med. GeselL. Wurzburg. 

 1882. 

 t The Author, " Notes from a Bacteriolog. Laboratory," Lancet, 



1885. 



'4 



