viii] MICROCOCCI 137 



As has been pointed out in Chapter VI. under Growth and 

 Division, in some species the cocci when growing on sohd 

 media enlarge many times the size of the typical unit before 

 division commences, others only enlarge slightly and then 

 at once divide. 



In many instances the individual members resulting from 

 division remain closely adherent without any definite arrange- 



FiG. 28, — Micrococcus from a Gelatine Culture, showing various Phases, of 

 Growth. 



ment, and thus form smaller or larger clusters (staphylo- 

 coccus), a kind of zooglcea or colonies, in which the indi- 

 viduals appear embedded in a hyaline gelatinous matrix ; the 

 amount of this varies in the different species ; in some there 

 is little of the matrix actually visible, the micrococci being 

 in close juxtaposition, in others it is easily recognised, the 

 interstices between the individuals being measurable. 



In some of the pigmented species (see below) the interstitial 



