Abstract
The time course of development of direct induction was studied by the method of electrostimulation.
1. Direct induction appears with a latency of about 40 msec., and for its full development it takes about 140 msec. after removal of the inducing light.
2. The latent period of direct induction is lengthened as the intensity and duration of inducing colored light are decreased.
3. The latent period of direct induction is independent of the in-tensity and the duration of the white light.
Prof. K. Motokawa furnished kind guidance and helpful criticism, for which we express here hearty thanks.
