1/3 The recent practice of propaganda has proved that it is possible, at least up to a certain point and within certain limits. Mass psychology is as yet far from being an exact science and the mysteries of human motivation are by no means all revealed. But at least theory and practice have combined with sufficient success to permit us to know that in certain cases we can effect some change in public opinion with a fair degree of accuracy by operating a certain mechanism,
@ebbot 2/3 jut as the motorist can regulate the speed of his car by manipulating the flow of gasoline. Propaganda is not a science in the laboratory sense, but it is no longer entirely the empirical affair that it was before the advent of the study of mass psychology. It is now scientific in the sense that it seeks to base its operations upon definite knowledge drawn from direct observation of the group mind, and upon the application of principles which have been demonstrated to be