Mast, Samuel Ottmar, 1871- · New York, J. Wiley · leaf 196
ES, FLY LARVAE, AND ECHINODERMS i8l mirror, i.e., toward the source of light, it soon begins tocrawl and turn so as to direct the anterior end away fromthe mirror, but in attempting this the anterior end extendsinto the direct light owing to the narrowness of the shadow.This produces a stimulus… … Fig. 29. Representation of arrangement of apparatus used to produce lightconditions in which negative fly larvae crawl toward the source of light or perpen-dicular to the rays, a, glass plate; b, b, beams of light; c, shadow cast by theopaque standard d; e, fly larva; g, Nernst glower; s, opaque…
Light -- Physiological effect · Phototropism
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