42 



A MANUAL OF BACTERIOLOGY 



2. Size. Measurements in terms of the micron. 



3. Reaction to stains : 



a. Simple stains : stains easily or with difficulty. 



b. Differential stains : Gram's stain, Ziehl-Neelson 

 stain, etc. 



B 



D 



a 



11 



FIG. 21. Types of growth of bacteria in stab cultures 



A to E, nonliquefying ; F to J, liquefying. A, filiform; B, beaded; C, echinulate ; 



D, villous; E, arborescent; F, crateriform; G, napiform : //, infundibuliform; 



I, saccate; J, stratiform 



4. Spores: time required for formation, media, position in cell. 



5. Special characters : 



a. Flagella. 



b. Capsule. 



c. Vacuoles. 



fl. Crystals or granules. 

 c. Involution forms. 



