20 



BACTERIOLOGY 



II. Stoke Culture (see plate cultural characters). 

 III. Plate Cultures, colonies. 

 A. Form. 



Punctiform, dimensions too slight for defining form by naked eye, 



minute, raised, semi-spherical. 

 Round, of a more or less circular outline. 

 Irregular. 

 Elliptical. 

 Fusiform, spindle-shaped, tapering at each end. 



^i:^ 



v_y 



^y 



Fig. 8. — Showing characters of gelatin stab cultures. 



A. Characters of surface elevation : i flat, 2 raised, 3 convex, 4 pulvinate, 5 capitate, 6 um- 

 bilicate, 7 umbonate. B. Characters of growth in depth : i flhform, 3 beaded, 3 tuber- 

 culate-ecinulate, 4 arborescent, 5 villous. 



Cochleate, spiral or twisted like a snail shell. Fig. 10, A. 



Ameboid, very irregular, streaming. Fig. 10, B. 



Mycelioid, a filamentous colony, with the radiate character of a 



mould. Fig. 11, D. 

 Filamentous, an irregular mass of loosely woven filaments. Fig. 



II, E. 

 Floccose, of a dense woolly structure. 



