Abstract
Electrical stimulation of melanophore nerves in the tail of Ameiurus nebulosus results in either blanching or darkening, depending on the characteristics of the stimuli. In blanching the nerve-fibers involved are probably adrenergic, in darkening probably cholinergic. This indicates that the melanophores in Ameiurus have a double innervation. a condition which probably also occurs in other teleosts and perhaps in the chameleon.

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