noting in this connection that KotarbiIiski's assumptions were proved true many years later, and that increasingly representatives of various scientific disciplines have come to observe paradigms of efficiency which had often tended to be ignored; empirical studies involving a large concentration of personnel, financial resources and equipment are now guided by the principles of efficiency and economy. In his second paper Kotarbiriski referred to Alfred Espinas, the French philosopher and sociologist, and to other authors who repre- sented the praxiological viewpoint, together with that of...