Quantitative measurement is essential to exact sciences. Political Science had lacked this method up to the end of the nineteenth century, Writing at the turn of the present century, Graham Walla’s said: “The efficacy of political science, its power of forecasting the results of political causes, is likely to increase…because modem psychology offers us a conception of human nature much truer though more complex than which is associated with die traditional English political philosophy, and under the influence and example of the natural sciences, political thinkers are already<\/p>