Figure $ Section of retina showing some of the immense complication of receptors (cones and rods) and nerve connections. The cones are at present presumed to be of at least three kinds in order to implement the trichromacy of colour vision.

L•ht Lens I ! Left: geniculate __ Right Visual areas in the• of ocO. p•d lobes Figure 4 The general scheme of connections between external field of view (top of diagram), the eyes and the brain. Facing page 505

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