1 8 BACTERIA I FORMS AND REPRODUCTION 



Gallic acid 5 gr. 



Tannin . 3 



Fused acetate of soda 10 



Distilled water . 4 . . . . 350 cc. 



(6) Drain and dip it again in the silver nitrate solution (4), 

 moving it about until the film becomes blackish. 



(7) Now wash it thoroughly in distilled water; dry it; when 

 quite dry mount it in xylol balsam, and examine with a high 

 power. 



I 

 2. 



FIG. 9. Vegetative reproduction of bacteria. 



1. Bacillus with successive divisions. 



2. Coccus giving rise to chain 3 (Streptococcus}, pairs 4 {Diplococci), 



irregular group 5 (Staphylococci). 



6. Coccus dividing in two directions (Micrococci). 



7. Coccus dividing in three directions (Sarcina>). 



4. Reproduction, (i) Vegetative Reproduction. 



When bacterial cells reach their adult normal form if the 

 conditions of temperature and nutrition are satisfactory, 

 a partition or septum is developed across the cell which 

 divides it into halves. The two halves, or daughter-cells, 

 then grow to an adult size and undergo similar division 

 (Fig. 9). The process is repeated, and vast numbers 



