Mast, Samuel Ottmar, 1871- · New York : J. Wiley & Sons · leaf 110
regionof one intcnHily to that of another, or to a change in theaxial position of the organism with reference to the sourceof light. There is no evidence that orientation In due to aconstantly acting directive stimulut in accord with Locbstheory of tropisma. Jennings doca not deny that the 84 UGBT… … Fic. 12. Illustration o( the devious path followed by Euglena in becomiogoriented when the direction of the light is reversed. From i to a the light comesfrom above; at 2 it is reversed. The amount of wandering (o-A) varies in differentAfter Jennings (igo6, p. 137). Torrey (1907, pp. 317, 319)…
Light · Phototropism
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