The following lecture on Monism is an informal address delivered extemporaneously on October 9, 1892, at Altenburg, on the seventy-fifth anniversary of the "Naturforschende Gesellschaft des Osterlandes." The immediate occasion of it was a previous address delivered by Professor Schlesinger of Vienna on "Scientific Articles of Faith." This philosophical discourse contained, with reference to the weightiest and most important problems of scientific investigation, much that was indisputable; but it

A society for investigating nature and ascertaining truth cannot celebrate its commemoration day more fittingly than by a discussion of its highest general problems. It must be regarded, therefore, with satisfaction that the speaker on such an august occasion as this—the seventy-fifth anniversary of your Society—has selected as the subject of his address a theme of the highest general importance. Unfortunately, it is becoming more and more the custom on such occasions, and even at the general me

1 ( return ) [ Scientific Articles of Faith . In Professor Schlesinger's address (delivered on 9th October at Altenburg) on this subject he rightly called attention to the limits of knowledge of nature (in Kant's sense of the terms) imposed upon us by the imperfection of our perceptive organs. The gaps which the empirical investigation of nature must thus leave in science, can, however, be filled up by hypotheses, by conjectures of more or less probability. These we cannot indeed for the time es