MICROCOCCUS AUREUS. 267 



from the pus of gonorrhoea. (See Fig. 56.) In what 

 way do the two preparations differ, the one from the 



other? 



FIG. 53. 



C 







Preparation from pus, showing pus-cells, A, and micrococci, C. 



After twenty-four hours in the incubator the plates 

 will be seen to be studded here and there with yellow 

 or orange-colored colonies, which are usually round, 

 moist, and glistening in their naked-eye appearances. 

 When located in the depths of the medium they are 

 commonly seen to be lozenge or whetstone in shape, 

 while often they appear as irregular stars with blunt 

 points, and again as irregularly lobulated dense masses. 

 In structure they are conspicuous for their density. 

 Under the low objective they appear, when on the sur- 

 face, as coarsely granular, irregularly round patches, 

 with more or less ragged borders and a dark irregular 

 central mass,' which has somewhat the appearance of 

 masses of coarser clumps of the same material as that 

 composing the rest of the colony. Microscopically, 

 these colonies are composed of small round cells, irreg- 

 ularly grouped together. They are in every way of 



