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Would it be narrowly utilitarian and even foolish to expect that one's learning shall necessarily function in practical life? And should the student rather rest content to acquire knowledge for its own sake, not bothering—for the present, at any rate—about actually bringing it to account in any way?

The use to which his ideas had to be put gave Dr. Reed an excellent test of their reliability. No doubt he passed through many stages of doubt as he investigated one theory after another. And he could not feel reasonably sure that he was right and had mastered his problem until his final hypothesis had been shown to hold good under varying actual conditions.

What test has the ordinary student for knowing when he knows a thing well enough to leave it? He may set up specific purposes to be accomplished, as has been suggested. Yet even these may be only ideas; what means has he for knowing when they have been attained? It is a long distance from the first approach to an important thought, to its final assimilation, and nothing is easier than to stop too soon. If there are any waymarks along the road, indicating the different stages reached; particularly, if there is a recognizable endpoint assuring mastery, one might avoid many dangerous headers by knowing the fact. Or is that particularly what recitations and marks are for? And instead of expecting an independent way of determining when he has mastered a subject, should the student simply rely upon his teacher to acquaint him with that fact?

7. The tentative attitude as a seventh factor in study

Investigators of the source of yellow fever previous to Dr. Reed reached conclusions as well as he. But, in the light of later discovery, they appear hasty and foolish, to the extent that they were insisted upon as correct. A large percentage of the so-called discoveries that are made, even by laboratory experiment, are later disproved. Even in regard to this very valuable work of Dr. Reed and his associates, one may feel too sure. It is quite possible that future study will materially supplement and modify our present knowledge of the subject. The scientist, therefore, may well assume an attitude of doubt toward all the results that he achieves.