LECTURE ON BACTERIOLOGY. 
361 
All these different organisms have become familiar to us 
under the generic term bacteria , which is a very unfortunate use 
of the term, as it really applies to only a single class of fungi. 
Cohn, whose classification I think is the simplest and the best, 
calls them schizomycetes , and makes the following classification : 
Classification of Schizomycetes (Bacteria). — 1 . Sphero- 
bacteria , or micrococci. 2. Micro-bacteria , or bacteria. 3. Desmo- 
bactei'ia , or bacilli. 4. Spiro-bacteria, or spirillae, spirochetse. 
I will now briefly refer to the more important features of 
each of these classes. 
First , of sphero-bactema, or micrococci. This is the simplest 
of the fungi, and appears as a minute organism of spherical form. 
It multiplies by fission—a single coccus forming two—these two 
producing four, and so on. They present a variety of appear¬ 
ances under the microscope, as you will observe in Fig. 1. From 
single isolated specimens (which under the highest magnifying 
Fig. 1.—Sphero-bacteria (Micrococci). A, Micrococcus vaccinse (x 1,000); B, same in 
chains (x 650); O, a zoogloea mass ; D, M. gonorrhoea (x 600. 
powers present nothing beyond minute points), you will observe 
them in pairs, again in fours, or in clusters of hundreds—yes, 
thousands (forming zoogloea), and still adhering together, form¬ 
ing chains. 
When a given specimen is about to divide, it is seen to 
elongate slightly, then a constriction is formed, which deepens 
