Mast, Samuel Ottmar, b.1871 · New York, J. Wiley & Sons; [etc., etc.] · leaf 92
FIG. 9. Sketches representing the reactions of an amoeba proceeding towardan intense area of light the rays of which were perpendicular to the slide. L, fieldof light formed by focusing a section of a Welsbach mantle on the slide, i-io,successive positions of the amoeba a little less than one-half…
Light -- Physiological effect · Phototropism
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