T h e light reactions of Stentor coeruleus have been described in detail by Jennings ('04a, p. 29) in a paper, entitled "Reactions to Light in Ciliates and Flagellates."His work shows conclusively that such reactions do not take place in accordance with the tropism theory as set forth by Loeb, Verworn, or Holt and Lee, but that the animals orient by means of "motor reactions," I'. e., by turning toward a structurally defined side (aboral), when stimulated, and then proceeding on a new path a t an angle with the old one.My experimental results, while THE JOURNAL OF EXPERIMENTAL ZOOLOGY, VOL.111, No. 3. 'After these Stentors had been in the aquarium in the light-grader 1.5 hours, no reactions were found to lower intensity than 4.8 candle-meters.
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S. O. Mast (1906) studied this question.