1. Phototactic reactions of young and adult Limulus are described.

  2. A method has been developed for studying the optokinetic responses of young animals to moving patterns.

  3. Evidence is presented that young animals can see the movement of patterns which consist of light and dark vertical stripes.

  4. The response is weak, and visual stimuli appear to have little influence on the behaviour of Limulus. Reasons for this are discussed.

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It was suggested (Northrop & Loeb, 1923; Loeb, 1893) that the temperature of the water determines whether Limulus will follow or avoid the light. But no experiments were described which proved this.

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