The author of this volume has a deliberate and very earnest purpose in view. He regards skepticism, with all allied forms of philosophical thought and method such as eclecticism, as likely to claim a far greater sphere of energy in the future than it has in the past. This, too, is in the domain not of theology only, but of philosophy and science as well. For these reasons he regards this work as possessing the extremely useful merit of opportuneness. It responds, indirectly, but not the less completely, to various indications and signs and forecasts which appear to announce a free and skeptical awakening and reenergizing of human speculation.