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Except by way of speculation and opinion, 3 the systematic psychology of intelligence remains almost untouched. Observationally one can say little more about intelligence than that it is what the intelligence tests test. So defined we can then go much further and state a variety of psycho-social capacities that depend in a measurable degree upon intelligence as the tests test it, but all this work has brought us little farther toward an understanding of the nature of intelligence, its meaning in psychological and physiological terms, and hence its position in the body of psycho-physiological fact. The present paper seeks to make from this point of view an initial attack upon the problem of speed in intelligence (as the tests test it). We wish to point out, however, that the experiments presented, although illustrative of certain points and indicative of others, are not sufficiently extended to determine conclusively the relation of intelligence to speed. We think that they indicate what the ultimate conclusion is likely to be, and that they point the way to a program of investigation.Among intelligence tests we have the speed tests and the 1 From the Harvard Psychological Laboratory. The junior author has conducted the experiment, tabulated the data, and made mat of the computations; the senior author has collaborated with her in the interpretation of the results.1 For example, see the Symposium on Intelligence and iu Measurement by fourteen authors, /.

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