CLASSIFICATION OF THE BACTERIA. 59 
Cu. 2. ZYGOSPOREZ. 
A. Volvocinee. A’. Myxomycetes. 
B. Conjuguez and Dia- 8B’. Zygomycetes. 
toms. 
Cu. 8. OOSPOREZ. 
A. Spheroplee. 
B. Ceeloplastez. Saprolegniz. 
C. Gidogonie. Peronosporee. 
Cu. 4. CARPOSPOREZ. 
A. Coleochetez. A’. Ascomycetes. 
B. Floridez. B’. Gicidiomycetes. 
C. Characee. C’. Basidiomycetes. 
Our preferences are for this last mode of classi- 
fication, but obliged, in the description of species, 
to follow the classification of Cohn, the most com- 
plete which has been given hitherto, we must 
abandon it for the present. 
§ 2. — CLASSIFICATION ; GENERIC AND SPECIFIC 
CHARACTERS. 
The numerous classifications of the bacteria of 
which we have given an abstract in the historical 
part of this work, show how variable have been 
the ideas of the microscopists as to the nature of 
these organisms. 
Before giving the most recent, those among 
which we will have to choose, it is best to study 
the characters upon which authors have depended 
for grouping the bacteria in genera and species, 
and to estimate the value of these characters. 
