20 NOTES ON MICRO-ORGANISMS. 
dichotoma shows coccus, rod and spiral forms (Plate IV., 
Fig. 1). 
It could only be expected that Zopf, after satisfying himself 
that distinct species of organisms could go through a cycle of 
changes at some period in which they might have departed from 
the typical form and were not to be identified, should have 
devised a classification to cover the morphological differences he 
had encountered. ‘The following is his highly elaborate system :— 
Class JI.—Coccacece—Micrococcus forms and threads of Cocci. 
,, 1I.—Bacteriacez, includes Cocci, short rods (Bacteria), 
long rods (Bacilli), long threads (Leptothrix), no 
spirals. 
», 11].—Leptotrichez, includes Cocci, Bacteria, Bacilli, 
Leptothrix, spirals. 
», 1V.—Cladotrichez, includes Cocci, Bacteria, Ber 
spirals, and false-branching. 
The first three classes include the forms mentioned by Cohn, 
Class I. being the same as Cohn’s. If I may venture to criticise 
the arrangement, I should say that it was hardly worth while 
establishing a new class (viz., No. IV.) for the false branching, 
which constitutes the only difference between Classes III. and IV. 
A very elaborate classification of the Schizomycetes has been 
arranged by Fliigge, but time and space will not allow me to intro- 
duce it in detail. It contains two general groupings into round or 
ovoid cells, and cylindrical cells, and about twelve different special 
groups. Very slight morphological differences are made a good 
deal of, and, generally speaking, the classification seems rather a 
cumbrous one. 
Nageli includes the whole of the classes in the one term, 
Schizomycetes, and maintains that Bacteria are allied to yeast, 
classing all the microscopic fungi producing decomposition as 
under :— 
Mucorini, or Moulds. 
Saccharomycetes, or Alcoholic ferments. 
Schizomycetes, or Bacteria. 
