however capable its possessor may be of restraining all other evidence of what he feels.
If these facts are not used as yet except in the academic experiments of the psychological laboratories and the very real and useful purpose to which they have been put in the diagnosis of insanities, it is not because they are incapable of wider use. The results of the "new psychology" are coming every day closer to an exact interpretation. The hour is close at hand when they will be used not merely in the determination of guilt and innocence, but to establish in the courts the credibility of witnesses and the impartiality of jurors, and by employers to ascertain the fitness and particular abilities of their employees.
Luther Trant, therefore, nowhere in this book needs to invent or devise an experiment or an instrument for any of the results he here attains; he has merely to adapt a part of the tried and accepted experiments of modern, scientific psychology. He himself is a character of fiction; but his methods are matters of fact.
