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 the first announcement that anything is going on. It is involved in any pang of hunger, of fear, or of love. It launches the adventure of knowledge. The object of this tentative knowledge is things in general, whatsoever may be at work (as I am) to disturb me or awake my attention. The effort of knowledge is to discover what sort of world this disturbing world happens to be. Progress in knowledge lies open in various directions, now in the scope of its survey, now in its accuracy, now in its depth of local penetration. The ideal of knowledge is to become natural science: if it trespasses beyond that, it relapses into intuition, and ceases to be knowledge.