42 BACTERIOLOGY. 



monly seen. (See Fig. 1, a.) With the streptococci, 

 however, the tendency is for the segmentation to con- 

 tinue in one direction only, resulting in the production 

 of long chains of 4, 8, and 12 individuals. (See Fig. 

 1,6.) 



The sarcinse divide more or less regularly in three 

 directions of space, but instead of becoming separated 

 the one from the other as single cells, the tendency is 

 for the segmentation to be incomplete ; the cells remain- 

 ing together in masses. The indentations upon these 

 masses or cubes, which indicate the point of incomplete 

 fission, give to these bundles of cells the appearance com- 

 monly ascribed to them that of a bale of cotton or a 

 packet of rags. (See Fig. 1, e.) 



The multiplication of bacilli is in the main similar 

 to that given for the micrococci. A dividing cell will 

 elongate slightly in the direction of its long axis ; an 

 indentation will appear about midway between its poles, 

 and will become deeper and deeper until eventually two 

 daughter cells will be formed. This process may occur 

 in such a way that the two young bacilli will adhere 

 together by their adjacent ends in much the same way 

 that sausages are seen to be held together in strings 

 (Fig. 2, /), or the segmentation may take place more at 

 right angles to the long axis, so that the proximal ends 

 of the young cells are flattened while the distal extremi- 

 ties may be rounded or slightly pointed (Fig. 2, e). 

 The segmentation of the anthrax bacillus, with which 

 we are subsequently to become acquainted, results, when 

 completed, in an indentation of the adjacent extrem- 

 ities of the young segments, so that by the aid of high 

 magnifying powers these surfaces are seen to be actually 

 concave. Bacilli never divide longitudinally. 



