An interesting application of the ideas of Nietzsche and Adler to the field of politics, with especial reference to revolution, class antagonism and class warfare. The revolutionary tendencies at present manifested in so many countries, are, the author maintains, due to reactions against feelings of class inferiority rather than to economic causes (such as were emphasised by the earlier socialists). Recent events have stimulated such reactions by emphasising the importance and indispensability of the proletariat and by diminishing class barriers, which, when—as previously—of larger dimensions, were felt to be natural, justifiable and inevitable. Though admittedly treating the phenomena from a single point of view only, the little book contains many suggestions that should be of interest to the student of social psychology.