_Otto Bauer_ is more learned and prosaic, more serious and more boring, than Renner. He cannot be denied the capacity to read books, collect facts, and draw conclusions adapted to the tasks imposed upon him by practical politics, which in turn are guided by others. Bauer has no political will. His chief art is to reply to all acute practical questions by commonplaces. His political thought always lives a parallel life to his will--it is deprived of all courage. His words are always merely the scientific compilation of the talented student of a University seminar. The most disgraceful actions of Austrian opportunism, the meanest servility before the power of the possessing classes on the part of the Austro-German Social-Democracy, found in Bauer their grave elucidator, who sometimes expressed himself with dignity against the form, but always agreed in the essence. If it ever occurred to Bauer to display anything like temperament and political energy, it was exclusively in the struggle against the revolutionary wing--in the accumulation of arguments, facts, quotations, _against_ revolutionary action. His highest period was that (after 1907) in which, being as yet too young to be a deputy, he played the part of secretary of the Social-Democratic group, supplied it with materials, figures, substitutes for ideas, instructed it, drew up memoranda, and appeared almost to be the inspirer of great actions, when in reality he was only supplying substitutes, and adulterated substitutes, for the parliamentary opportunists. _Max Adler_ represents a fairly ingenuous variety of the Austro-Marxian type. He is a lyric poet, a philosopher, a mystic--a philosophical lyric poet of passivity, as Renner is its publicist and legal expert, as Hilferding is its economist, as Bauer is its sociologist. Max Adler is cramped in a world of three dimensions, although he had found a very comfortable place for himself with the framework of Viennese bourgeois Socialism and the Hapsburg State. The combination of the petty business activity of an attorney and of political humiliation, together with barren philosophical efforts and the cheap tinsel flowers of idealism, have imbued that variety which Max Adler represented with a sickening and repulsive quality.