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 that makes comparisons possible. We may impress any number of forms successively on the same water, and the identity of the substance will not help those forms to survive and accumulate their effects. But if we have a surface that retains our successive stampings we may change the substance from wax to plaster and from plaster to bronze, and the effects of our labour will survive and be superimposed upon one another. It is the actual plastic form in both mind and body, not any unchanging substance or agent, that is efficacious in perpetuating thought and gathering experience.

Were not Nature and all her parts such models of patience and pertinacity, they never would have succeeded in impressing their existence on something so volatile and irresponsible as thought is. A sensation needs to be violent, like the sun’s blinding light, to arrest attention, and keep it taut, as it were, long enough for the system to acquire a respectful attitude, and grow predisposed to resume it. A repetition of that sensation will thereafter meet with a prepared response which we call recognition; the concomitants of the old experience will form themselves afresh about the new one and by their convergence give it a sort of welcome and interpretation. The movement, for instance, by which the face was raised toward the heavens was perhaps one element which added to the first sensation, brightness, a concomitant sensation, height; the