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148 frequently, so frequently in fact as to seem the rule, backwardness has been conceived as an intrinsic and eternal mark of inferiority. And then every attempt to be less backward has been frowned upon as the sedition, which, under these conditions, it undoubtedly is. In our own race wars we can see some of the results of the failure to realize that time would gradually obliterate the slave morality of the Negro, and that social adjustment based on this morality would begin to break down.

It is hard not to picture the future as if it obeyed our present purposes, to annihilate whatever delays our desire, or immortalize whatever stands between us and our fears.

In putting together our public opinions, not only do we have to picture more space than we can see with our eyes, and more time than we can feel, but we have to describe and judge more people, more actions, more things than we can ever count, or vividly imagine. We have to summarize and generalize. We have to pick out samples, and treat them as typical.

To pick fairly a good sample of a large class is not easy. The problem belongs to the science of statistics, and it is a most difficult affair for anyone whose mathematics is primitive, and mine remain azoic in spite of the half dozen manuals which I once devoutly imagined that I understood. All they have done for me is to make me a little more conscious of how hard it is to classify and to sample.