Image from page 450 of “General physiology; an outline of the science of life” (1899) – more Marine Life goodness curated by www.SardineRunPE.co.za
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Title: General physiology; an outline of the science of life
Year: 1899 (1890s)
Authors: Verworn, Max, 1863-1921 Lee, Frederic S. (Frederic Schiller), 1859-1939, ed. and tr
Publisher: London, Macmillan and co., limited New York, The Macmillan company
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons
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V 5 // ^f: 111 Fia. 211.— Chemotaxis of Bacteria toward oxygen which is produced by Alga-cells in the light. 1,Diatom evolving oxygen in sunlight and surrounded by Spirilla. II, Diatom half-shaded,half-illuminated. The Bacteria have collected in the illuminated half, where oxygen is beingevolved. ///, An Alga-cell surrounded by Bacteria ; A, in the dark, B, in the light. (// and/// after Engelmann.) plants. The spermatozoon seeks the ovum, and almost everywherein the living world is led in the right path by the chemotacticaction which the metabolic products of the egg-cell exert upon the STIMULI AND THEIR ACTIONS 435 freely-moving sperm-cell (Fig. 212). The fact, which must other-wise appear very wonderful, that among the innumerable swarm ofspermatozoa of the various marine animals every species findsthe proper ovum, is in a great majority of cases a direct resultof chemotaxis, and is explained very simply by the further factthat every species of spermatozoon is chemotactic to thes
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