THE GROWTH AND APPEARANCES OF COLONIES 89 



of a particular colony the process of fishing, as it is called, is 

 resorted to. 



The colony having been placed under the field of the micro- 



Fig. 35. Types of growth in stab-cultures: A, Non-liquefying: i, 

 Filiform (Bacillus coli); 2, beaded (Streptococcus pyogenes); 3, echinate 

 (Bacterium acidi lactici); 4, villous (Bacterium murisepticum) ; 5, arbor- 

 escent (Bacillus mycoides). B, Liquefying: 6, Crateriform (Bacillus 

 vulgare, twenty-four hours); 7, napiform (Bacillus subtilis, forty-eight 

 hours); 8, infundibuliform (Bacillus prodigiosus) ; 9, saccate (Micro- 

 sporon Finkleri); 10, stratiform (Psorospermum fluorescens) (Frost). 



scope, a long platinum needle, the point slightly bent, is 

 passed between the lens and the plate so as to be visible 

 through the microscope, then turned downward until the 

 colony is seen to be disturbed, and the needle is dipped into 



