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Biol Bull 77: 354-363. (December 1939)
© 1939 Marine Biological Laboratory
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DARK ADAPTATION AND REVERSAL OF PHOTOTROPIC SIGN IN DINEUTES

J. E. G. RAYMONT 1

1 From the Biological Laboratories, Harvard University

1. When all eyes are functional, Dineutes horni is positively phototropic after dark or light adaptation.

2. With one or with two eyes functional, Dineutes is positively phototropic when light-adapted, but is negatively phototropic when fully dark-adapted.

3. At intermediate stages of dark and light adaptation, the beetle moves at an angle to the light rays. The courses of dark and of light adaptation were followed by a study of these "angles of deviation" from the incident rays.

4. Possible theories are discussed to account for these results.






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Copyright © 1939 by the Marine Biological Laboratory.