Mast, Samuel Ottmar, 1871- · New York, J. Wiley · leaf 153
two sources as indicated in Fig. 18,2. In the light grader (see Fig. 4) so arranged as to producea field of light which consists of parallel rays, but in whichthe intensity gradually diminishes from side to side so thatone side of a colony, swimming toward the source of light,is more strongly… … Fig. 18. Representation of the movement of Volvox when subjected to lightfrom two sources, a, plate ^lass aquarium 8 cm. long and 8 cm. wide; b, 222-voltNernst glower, 66 cm. from aquarium (distance from aquarium constant); c, iio-volt glower (distance from aquarium variable); d, screen; e, point…
Light -- Physiological effect · Phototropism
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