BACTERIA AS PLANTS. 



of beads, called Streptococci (Fig. 4). Other species 

 divide first in one direction, then at right angles 

 to the first division, and a third division follows at 

 right angles to 

 the plane of 

 the first two, 

 thus producing 

 solid groups of 

 fours, eights, 

 or sixteens 

 (Fig. 5), called 

 Sarcina. Each 

 different spe- 

 cies of bacteria 

 is uniform in 

 its method of 

 division, and 

 these differen- 

 ces are there- 

 fore indica- 

 tions of differ- 



FIG. 2. Method of multiplication of bacte- 

 ria : a and b, Bacteria dividing by fis- 

 sion ; c, A yeast multiplying by budding. 



ences in spe- 

 cies, or, according to our present method of 

 classification, the different methods of division 



FIG. 3. Micrococci. 



FIG. 4. Streptococci. 



represent different genera. All bacteria produ- 

 cing Streptococcus chains form a single genus Strep- 



