 In his published Letters on the Kantian Philosophy Reinhold had excused himself from the task of presenting and examining the theoretical foundations of Kant’s Critical philosophy, in order to concentrate instead upon the practical consequences of the same. But once he arrived at Jena he set himself to the former task, the surprising result of which was not so much the popularization of another aspect of Kant’s thought as a first, historically momentous effort to revise and recast the theoretical foundations of the new transcendental idealism in a new, allegedly more coherent and systematic form. The fruit of this revisionist effort was Reinhold’s own “Elementary Philosophy” (see below), which, though only a passing phase in Reinhold’s own development as a philosopher, remains his most substantial and effective contribution to the historical development of German Idealism.