Summary.Micro‐electrode, amplifier and cathode ray oscillograph have been used for the recording of “spikes” from restricted units in the retina of anaesthetized snakes in response to monochromatic light of known energy content. The problem has been to study the distribution of sensitivity to monochromatic light of more or less restricted discharges in this cone eye.There is a broad dominator band of sensitivity with maximum in 0.560 μ, similar to the dominator found in the frog's eye.There are further two narrow modulator bands of sensitivity with maxima in respectively 0.600 and 0.520 μ.The “red” modulator is sometimes obtained in the practically isolated state but generally the “green” modulator appears coupled to it so that a secondary hump of variable size is found with max