  The extremely long gestation period of the PAO seems to have been the product of a variety of factors. First and foremost, monetary considerations compelled Vaihinger to find permanent academic employment. To further his candidacy, Vaihinger decided to bring out a Commentary on Kant’s Critique of Pure Reason in honor of the centenary of the first Critique’s publication. The first volume of the Commentary was released in 1881, and helped Vaihinger secure a permanent position at the University of Halle. The second volume followed in 1892. A sense of the scholarly depth of Vaihinger’s work is given by the fact that the two-volume Commentary, which deals only with the KrV’s Prefaces, Introductions, and Transcendental Aesthetic, reaches nearly 1,100 pages. Moreover, a number of personal and professional engagements occupied Vaihinger in the last decade of the century. In 1889 he married Elisabeth Schweigger, the daughter of a Berlin bookseller. In 1892 they had a son, Richard, and in 1895 a daughter, Erna. In 1896, he founded the journal Kant-Studien, and in 1901 the Kant Gesellschaft.