Show ine Una ngIng color color ol 01 of broga bogs frogs whether r blind or not become dark green or black if they are kept in a dark vessel in a sparingly lighted room but when a branch with green leaves is introduced into the vess vessel elthey they all recover their brig bright ht green color in some way unknown the reflected green light acts either upon the nerves of the skin or what seems more probable if Stein achs experiments are taken into account directly upon lipon the p pigment u t cells moreover the sen sensations sensation satio ane d derived from the toes have also an influence upon the changes of color when the bottom of the vessel Js Is covered with a felt or with a thin wire wire net the fro fros frogs s also become black recovering their green color when a green greeir branch is introduced into the tha ve vy pl 1 |