American journal of physiology . lide with the wall nearer the light. For lack of posi-tively heliotropic organisms this latter conjecture has not been verified. Thus the response as observed is seen to be the one followingmost naturally from Verworns hypothesis. When an individualreaches the wall of the trough the factor that favors its further pro-gress in the direction of its optimal light-intensity, is the differencebetween the angle of collision (/. c, the angle made by d with thewall) and a right angle; and this will be referred to as the essentialfeature in the following type of orienta
American journal of physiology . lide with the wall nearer the light. For lack of posi-tively heliotropic organisms this latter conjecture has not been verified. Thus the response as observed is seen to be the one followingmost naturally from Verworns hypothesis. When an individualreaches the wall of the trough the factor that favors its further pro-gress in the direction of its optimal light-intensity, is the differencebetween the angle of collision (/. c, the angle made by d with thewall) and a right angle; and this will be referred to as the essentialfeature in the following type of orientation. We now come to the fourth and much discussed case, in whichthe rays of light fall obliquely through the prism (Fig. 7). Theirsource may be (A) above the thicker end, or (C) above the thinner 1 TowLE: Loc. cit., p. 362. 476 Edwm B. Holt and Frederic S. Lee. end of the prism. In the former case an animal moving from thesource of light comes into a region of higher intensity; in the latter case, into a region of lower a B C R.
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