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72 Zurich Association Studies indicate clearly that slight mental fatigue, an inner disturbance of attention or an external distraction, tend to "flatten" the quality of the response. An example of the very "flat" type is the clang association (cat-hat), a reaction to the sound and not to the sense of the stimulant word. One test, for example, shows a 9% increase of clang in the second series of a hundred reactions. Now the clang is almost a repetition, a very primitive form of analogy.

If the comparatively simple conditions of a laboratory can so readily flatten out discrimination, what must be the effect of city life? In the laboratory the fatigue is slight enough, the distraction rather trivial. Both are balanced in measure by the subject's interest and self-consciousness. Yet if the beat of a metronome will depress intelligence, what do eight or twelve hours of noise, odor, and heat in a factory, or day upon day among chattering typewriters and telephone bells and slamming doors, do to the political judgments formed on the basis of newspapers read in street-cars and subways? Can anything be heard in the hubbub that does not shriek, or be seen in the general glare that does not flash like an electric sign? The life of the city dweller lacks solitude, silence, ease. The nights are noisy and ablaze. The people of a big city are assaulted by incessant sound,