An account of the recent researches into the history of the Bacteria : made by, and under the direction of, Prof. Cohn / by F. Jeffrey Bell.

  • Bell, F. J. (Francis Jeffrey), 1855-1924.
Date:
[1876]
Catalogue details

Licence: Public Domain Mark

Credit: An account of the recent researches into the history of the Bacteria : made by, and under the direction of, Prof. Cohn / by F. Jeffrey Bell. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    9. Rhabdomonas rosea, n. sp. This form, which also came from Kahla, had a spindle-shaped appearance, with pale rosy-red corpuscles within, of ’0038—'005 mm, and a length •02—-03 mm.; the cells were single and the corpuscles were dark, and highly refractive, in addition to which vacuoles were observed at the middle and ends; their movement was a trembling backwards and forwards, with a continual turn- ing around their long axis ; he has no doubt of the existence of a flagellum, though he only once saw it with distinct- ness. 10. Monas Warmingii, n. sp., was obtained from Dr. Warming, of Copenhagen, who found it in pools of brackish water, where marine plants were decaying, in the company of nearly all the forms—except Ascococcus—which have been described above; it resembled, save that it was broader, Monas Okenii; the body was clear, and the contained protoplasm firm and of a pale red, filled with dark red gra- nules, only at the rounded extremities; length ’015—'02 mm., breadth '008 mm.; their movement was irregular (taumelnd), but much more active than that of M. Okenii; posteriorly, there projected a flagellum ; when division of the cells is about to occur, the middle, which was before devoid of granules, becomes filled with them, so that when division is accomplished the two new cells have the characteristic ter- minal groups of granules, at once; this form also differs from M. vinosa of Ehrenberg in its larger size. 11. Ophidomonas sangidnea, Ehr., a form of varying size and breadth, which Cohn found in Dr. Warming’s water, is thought by him, after a long consideration,to be the same as that discovered by Ehrenberg in 1836. Although, indeed, since Cohn has himself shown, that Spirillum volutans has a fine flagellum at each end,1 there is no difference between Spi- rillum and Ophidomonas; unless the smaller species (S. termo, S. undula) be shown not to possess flagella, when the generic term Spirillum would be justly theirs. 12. But a more important question is the relation of the Bacteria to the Monads; on the one hand, it may be said that the Monads are Bacteria. The Monad form here called Clalhrocystis roseo-persicina was considered by Prof. Hay Lankester as a “ peach-coloured Bacterium and Ehrenberg supposes that all the Bacteria possess cilia, (Frau Liiders, as stated in the account of Cohn’s earlier paper, has asserted the occurrence of one flagellum in B. termo2) ; and if this be the 1 4 Quart. Journ. Mic. Sci.,’ April, 1873. 2 loc. cit., p. 158.