The first effect of experimental analysis is, as we saw, to reduce objects directly experienced to data. This resolution is required because the objects in their first mode of experience are perplexing, ob- scure, fragmentary} in some way they fail to answer aneed. Given data which locate the nature of the problem, there is evoked athought of an operation which if put into execution may eventuate in asituation in which the trouble or doubt which evoked inquiry will be resolved. If one were to trace the history of science far enough, one would reach atime in which the acts which dealt with atroublesome situation would be organic responses of astructural type together with afew acquired habits. The most elaborate technique of present in- quiry in the laboratory is an extension and refinement of these simple original operations.