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Rh control. In this way, the student gets the benefit of technical scientific methods of discovery and testing, while he retains his sense of the identity of the laboratory modes of energy with large out-of-door realities, thereby avoiding the impression (that so often accrues) that the facts studied are peculiar to the laboratory.

§ 3. Communication of Information

When all is said and done the field of fact open to any one observer by himself is narrow. Into every one of our beliefs, even those that we have worked out under the conditions of utmost personal, first-hand acquaintance, much has insensibly entered from what we have heard or read of the observations and conclusions of others. In spite of the great extension of direct observation in our schools, the vast bulk of educational subject-matter is derived from other sources—from text-book, lecture, and viva-voce interchange. No educational question is of greater import than how to get the most logical good out of learning through transmission from others.

Doubtless the chief meaning associated with the word instruction is this conveying and instilling of the results of the observations and inferences of others. Doubtless the undue prominence in education of the ideal of amassing information (ante, p. 52) has its source in the prominence of the learning of other persons. The problem then is how to convert it into an intellectual asset. In logical terms, the material supplied from the experience of others is testimony: that is to say, evidence submitted by others to be employed by one's own judgment in reaching a conclusion. How shall we treat the subject-matter supplied by text-book and teacher so that it shall rank as material for reflec-