Mast, Samuel Ottmar, 1871- · New York, J. Wiley · leaf 111
- time the eye-spot becomes f ? f < ^ <ac … -«« ■«^ -«« -*<*: -^K -<<f« -^^ -<|S« -««C n ■««« I 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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