BY JOHN THOMSON, M.B. 7 a 
CLASSIFICATION .— Continued. 
Pathogenic. 
hte 
4.—According to virulence, -. - Menpariecenie 
—_ 
. 
Diplococci. 
5.—According to manner of divi- | 2- Streptococci. 
SIGH Sri eee Staphylococci. 
Leptothrix, ete. 
> oe bo 
: ‘ ( 1. Endospore. 
6.— According te sporulation, 
2. Arthrospore. 
7 “Accordins torcolourses'. oa) ec oe 
2. Nonehromogenic. 
' ( I. Hy phomycetes. 
8.—Bacteria that contain m0 9. Saccharomycetes. 
chlorophyll (fungi), . - | 3. Schizomycetes. 
The simplest classification is that based upon (1) morpho- 
logical characteristics—that is, shape and form, and (5) the 
manner of division. 
1.—Gecei—round, spherical or oval cells, which always 
retain their shape. no matter in what natural or artificial 
media they may grow. 
1. Monococci—single forms. 
2. Diplococci—when the cells are in pairs. 
3. Tetracocci—when the cells divide in two directions 
on the same plane, forming squares. 
4. Sarcinae—when the cells divide in three directions 
on different planes, forming cubes. 
5. Streptococci—when the cells are arranged in 
chains or beads. 
when the cells are in irregular 
clumps or bunches, like bunches of grapes. 
Zooglea—when the cells are embedded in their 
own glutinous secretions. 
6. Staphylococci 
~I 
1]. —Bacilli—rod hike structures in which the greater 
diameter is more than twice the lesser. They may be long 
and thin ; or plump and almost round ; they may have square, 
pointed, round or clubbed ends, and they may arrange them- 
selves in pairs, chains, clumps or filaments. They may be 
rigid or flexible ; motile or non-motile. 
I11.—Spirilia—Rods having a curved or spiral form. 
1. Spirocheete. 
2. Vibrios. 
