Mast, Samuel Ottmar, b.1871 · New York, J. Wiley & Sons; [etc., etc.] · leaf 155
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… … d \f mmmsm?m§^; a f
Light -- Physiological effect · Phototropism
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