Mast, Samuel Ottmar, b.1871 · New York, J. Wiley & Sons; [etc., etc.] · leaf 113
eding rotation. While in thisposition, the body is somewhat straightened, so that theanterior end is not carried back as far during the followingrotation, and when the dorsal surface comes to face thelight it is directed more nearly toward its source than it 96 LIGHT AND THE BEHAVIOR OF ORGANISMS… … -«^ -^< -^0< -^i^^ -^S -«a -<^ ■<r- -<«s ^ n -«*. Fig. 13. Euglena sp. (?) in crawling state, showing details in process of orien-tation; V, contractile vacuole; es, eye-spot; n, o, direction of light; a-c, positionsof Euglena with light from n intercepted; c-m, positions after light…
Light -- Physiological effect · Phototropism
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