294 



PRACTICAL DAIRY BACTERIOLOGY 



mentation tube. /. Two milk tubes, one to be kept at 70 and 

 the other at 98. g. Two potato tubes, one at 70 and one at 

 98. Allow the cultures to grow several days, examining each 



FIG. 84 TYPES OF GELATIN STAB GROWTHS 

 a. Filiform, b. Beaded, c. Echinate. d. Villous. e. Arborescent 



a b c d e 



FIG. 85 TYPES OF GELATIN LIQUEFACTION 

 a. Crateriform. b. Napiform. c. Infundibuliform. d. Saccate, c. Stratiform 



day. For each species of bacterium make a careful record, 

 noting especially the following points: 



Agar slant. Note the type of surface growth as compared 

 with figure 19. 



'Morphology. Stain and study with the microscope, noting 

 shape formation of chains spores determine motility. (See 

 No. 31.) 



Gelatin stab. Note liquefaction needle growth surface 



