Abstract
1. 1. The chromatic activity and potency of adrenergic stimulants are described for intact specimens, and specimens with lesions in the chromatic tracts, of Pleuronectes platessa L. 2. 2. Changes in sensitivity to sympathomimetic amines after spinal section, spinal nerve section, treatment with adrenergic neurone blocking agents or cocaine suggest that postganglionic, adrenergic fibres pass from the sympathetic ganglia to the melanophores by way of mixed spinal nerves. 3. 3. The adrenergic transmitter causes melanophore pigment aggregation by combining with alpha-adrenoceptors.
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