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What duty has the less mature student in regard to organization? Should the statements that he receives be put into order by him? Are some to be selected as vital, others to be grouped under these, and still others to be slighted or even entirely omitted from consideration, because of their insignificance? And is he to determine all this for himself, remembering that thorough study requires the neglect of some things as well as the emphasis of others? Or do all facts have much the same value, so that they should receive about equal attention, as is the case with the multiplication tables? And, instead of being grouped according to relations and relative values, should they be studied, one at a time, in the order in which they are presented, with the idea that a topic is mastered when each single statement upon it is understood? Or, if not this, has the reliable author at least already attended to this whole matter, making the various relations of facts to one another and their relative values so clear that the student has little work to do but to follow the printed statement? Is it even highly unsafe for the latter to assume the responsibility of judging relative values? And would the neglect or skipping of many supposedly little things be more likely to result in careless, slipshod work than in thoroughness?

4. The judging of the worth of statements, as a fourth factor in study

The scientist in charge of the above-mentioned investigation was, no doubt, a modest man. Yet he saw fit to question the old assumption that yellow fever was spread by invisible particles called "fomites." Indeed, he had the boldness to disprove it. Then he disproved, also, the assumption that the fever was contagious by contact. After that he set out to test a hypothesis of his own. His attitude toward the results of former investigations was thus skeptically critical. Every proposition was to be questioned, and the evidence of facts, rather than personal authority or the authority of time, was the sole final test of validity.