COLOR CHANGES IN FUNDULUS AFTER HYPOPHYSECTOMY

Abstract

When the hypophysis of a Fundulus is ground up in 0.05 cc. N/10 NaCl and a scale from this fish is mounted in such an extract, the xanthophores "expand" while the melanophores "contract," although brain and muscle extracts prepared in the same way have no effect on the pigment cells. Nevertheless, when the hypophysis is removed, the animal still responds to changes in background and to total darkness in the usual manner.