. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. 472 THIRD PART.—BACTERIA OR SCHIZOMYCETES. and these break up into fragments containing from two to several coils and exhibiting active movement; they were formerly known by the name of Ophidomonas, and are said to have a long oscillating cilium at each extremity (Fig. 198 E). The same states have been observed in Beggiatoa roseo-persicina as in B. alba; the net-like zoogloea-form, once known as Clathrooystis, is a peculiar and remarkable feature in this species. Clad
. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. 472 THIRD PART.—BACTERIA OR SCHIZOMYCETES. and these break up into fragments containing from two to several coils and exhibiting active movement; they were formerly known by the name of Ophidomonas, and are said to have a long oscillating cilium at each extremity (Fig. 198 E). The same states have been observed in Beggiatoa roseo-persicina as in B. alba; the net-like zoogloea-form, once known as Clathrooystis, is a peculiar and remarkable feature in this species. Cladothrix and Iioptothrix buccalis of tooth-caries resemble each other in their development. Further details will be found in Zopf s descriptions. The Fungi of mother of vinegar, Arthrobacterium aceti and A. Pastorianum (Hansen), must also be placed in the arthrosporous group. They are distinguished it is true, as Hansen has observed, by the occur- rence of many large vesicular cells between the small cocci or rod-cells of a chain, and the almost constant appearance of these cells at once suggests that they are connected with some process of spore-formation. But the observations afford no distinct support to this view, and the phe- nomenon must for the present be classed with those of involution which were mentioned on a former page. The Micrococcus also of Pasteur's fowl-cholera may also be- long to this group'. Section CXXXII. The fore- going review of the Bacteria will supply us with some safe means of determining the question of the specific value of observed forms, a question which is at present the subject of much discussion,and which must not therefore be ignored in this place. There are two views on this subject which appear at least to be diametrically opposed to one another. One of these is, as it seems to me, incorrectly ascribed to Cohn, and maintains that every Bacterium which occurs in the same growth-form and produces the same effects of decomposition, though this
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