Abstract
1. Specimens of Palaemonetes vulgaris which had been exposed to light so that their retinal pigments were in positions characteristic for that state were injected with crustacean eye-stalk extract, in one series prepared from animals that had been in the dark-room overnight, and in a second series prepared from specimens that had been kept on a black background. There was no significant change in the position of the distal retinal pigment cells in either series.2. When, stalk extracts were prepared from light-adapted animals and were injected, in the dark, into Palaemonetes in which the retinal pigments were adapted to darkness, a proximal migration of the distal retinal pigment occurred towards the position found typically in the eyes of specimens adapted to light.3. If the rate of distal pigment migration following experimental injection is plotted, a sigmoid curve is obtained similar to that found by Welsh for the normal rate of migration when a single individual adapts to light.4. Histological study of ...
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