Georg kaiser's work is often treated as the reflection of its author's unusual personality. Such a treatment, though valid, tends to obscure the fact that his writings, in their probing of existing values, their manifestation of Lebensangst, their quest for regeneration, and their hope for redemption, also reflect the intellectual and spiritual concerns of his period. That his visions were not, as has been often held, the phantasies of an extreme subjectivist, but that they accurately mirrored the age, is demonstrated by the fact that representative thinkers of the period, such as Bergson, Vaihinger, and Jaspers, voiced similar concerns, arrived at similar conclusions, sought similar solutions. There seems to exist a particularly strong affinity between the ideas of Walther Rathenau and those presented in Kaiser's social tetralogy (Die Koralle, 1917; Gas, 1918; Hölle Weg Erde, 1919; Gas, Zweiter Teil, 1920), which was written at a time when the impact of Rathenau's works (Zur Kritik der Zeit, 1912; Zur Mechanik des Geistes oder Vom Reich der Seele, 1913; Von kommenden Dingen, 1917) on the intellectual life of Germany was very strong. Even though explicit references by Kaiser to Rathenau could be found neither in Kaiser's published work nor inhis correspondence and other unpublished material, there is, I believe, enough circumstantial evidence to make a plausible case for Kaiser's indebtedness to Rathenau. To present this evidence and, by so doing, to contribute to a better understanding of Kaiser's social tetralogy, is the purpose of this study. I shall first briefly summarize Rathenau's ideas, then present the evidence for his influence on Kaiser, and, in conclusion, speculate very briefly on the nature of this influence.