. The Cambridge natural history. Zoology; Zoologia Geral. VI CILIATA 149 mytilus the produce of a being after conjugation died of senility after 336 fissions; in Leucoplirys after 660. Save in the Peritrichaceae (p. 151) conjugation takes place between similar mates, either of the general character and size of the species, or reduced by fissions, in rapid succession, induced by the same conditions as those of mating. The two mates approach, lying parallel and with their oral faces or their sides (Stentor} together,. 22 M : M Z2 Z2 M ; M - 53.—Diagram of conjugation iu Ooljiii/iidii colpoda. Ho
. The Cambridge natural history. Zoology; Zoologia Geral. VI CILIATA 149 mytilus the produce of a being after conjugation died of senility after 336 fissions; in Leucoplirys after 660. Save in the Peritrichaceae (p. 151) conjugation takes place between similar mates, either of the general character and size of the species, or reduced by fissions, in rapid succession, induced by the same conditions as those of mating. The two mates approach, lying parallel and with their oral faces or their sides (Stentor} together,. 22 M : M Z2 Z2 M ; M - 53.—Diagram of conjugation iu Ooljiii/iidii colpoda. Horizontal line means degenera- tion ; parallel vertical lines, separation of gametes ; broken lines (above), boundary between pairing animals ; (below), first fission ; single vertical line, continuity or enlargement. M, Meganucleus ; /x, micronucleus ; Z, zygote-nucleus. and partially fuse thereby; though no passage of cytoplasm is seen it is probable that there is some interchange or The meganucleus lengthens, becomes irregularly constricted, and breaks up into fragments, which are ultimately extruded or partially digested. The micronucleus enlarges (Fig. 5 2, A) and conditions ; and that minute doses of beef-tea or various mineral salts will not only keep up the higher rate, but even stave off senescence. Minute doses of alcohol will keep up the higher rate, but not avert senescence. He considers that Maupas' generalisations are in most respects too sweeping (Arch. Entw. xv. 1902, p. 139). But Dr. James Y. Simpson informs me that the possibility of stimulative regeneration has been found to be limited. See also Calkins and Lieb, Arch. Prot. i. 1902, p. 355. 1 As inferred by Hickson from the prolongation of the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harmer, S. F. (Sidney Frederi
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