. Eight lectures on the signs of life from their electrical aspect . Medium. -! !' Strong. 20 40 60 ao 100 Fig. 18.—Frog. Retinal response to illumination of constant duration and of varying strength. The unit of light is a standard candle at a distance of lo feet from the eyeball. Now this curve, concave to its abscissa OX, with the effect Y increasing less rapidly than its excitant cause X, is in

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