This is an EXACT reproduction of a book published before 1923. This IS NOT an OCR'd book with strange characters, introduced typographical errors, and jumbled words. This book may have occasional imperfections such as missing or blurred pages, poor pictures, errant marks, etc. that were either part of the original artifact, or were introduced by the scanning process. We believe this work is culturally important, and despite the imperfections, have elected to bring it back into print as part of our continuing commitment to the preservation of printed works worldwide. We appreciate your understanding of the imperfections in the preservation process, and hope you enjoy this valuable book.

Such are the words of the psychologist, DuBois-Reymond, in one of his well-known lectures. The agnostic attitude is the most seemly that it is possible to take. Nowadays, not only have all religious ideas been upset, but so too has everything which until now appeared most solid, most indivisible. Who has faith any longer in the atom? Who believes in the soul as a monad? Who believes in the objective validity of the senses?

His negation had no reference, --far from it, --to women, to love, or to friends, things where the pedantic and ostentatious scepticism of literary men of the Larra type usually finds its fodder; his nihilism was much more the confusion and discomposure of one that explores a region well or badly, and finds no landmarks there, no paths, and returns with a belief that even the compass is not exact in what it shows.