42 



A MANUAL or BACTEEIOLOGY 



2. Size. Measurements in terms of the micron. 



3. Reaction to stains : 



a. Simple stains : stains easily or with difficulty. 

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

 stain, etc. 



B 



r» 



D 



F 



G 



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



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



D, villous; E, arborescent; F, crateriform; G, napiform; H, iBfundibuliform; 



/, saccate; J, stratiform 



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



5. Special characters : 



a. Flagella. 



b. Capsule. 



c. Vacuoles. 



d. Crystals or granules. 



e. Involution forms. 



