Mast, Samuel Ottmar, 1871- · New York : J. Wiley & Sons · leaf 122
facedthe light during the preceding 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 UCBT… … Fio. 13. Euglena sp. (?) in crawling state, showing details in processor onen- tation; r, contractile vacuole; u, eye-spot; li, a, direction of light; a-e, positionsof Euglena with light from n intercepted; c-m, positions after Ught from » is turnedon and that from 0 cut off so as to change the…
Light · Phototropism
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