This volume presents some results of the work done in the matter of logical theory in the Department of Philosophy of the University of Chicago in the first decade of its existence. The eleven Studies are the work of eight different hands, all, with the exception of the editor, having at some period held Fellowships in this University, Dr. Heidel in Greek, the others in Philosophy. Their names and present pursuits are indicated in the Table of Contents. The editor has occasionally, though rarely, added a footnote or phrase which might serve to connect one Study more closely with another. The pages in the discussion of Hypothesis, on Mill and Whewell, are by him. With these exceptions, each writer is individually and completely responsible for his own Study.

The various Studies present, the editor believes, about the relative amount of agreement and disagreement that is natural in view of the conditions of their origin. The various writers have been in contact with one another in Seminars and lecture courses in pursuit of the same topics, and have had to do with shaping one another's views. There are several others, not represented in this volume, who have also participated in the evolution of the point of view herein set forth, and to whom the writers acknowledge their indebtedness. The disagreements proceed from the diversity of interests with which the different writers approach the logical topic; and from the fact that the point of view in question is still (happily) developing and showing no signs of becoming a closed system.

If the Studies themselves do not give a fair notion of the nature and degree of the harmony in the different writers' methods, a preface is not likely to succeed in so doing. A few words may be in place, however, about a matter repeatedly touched upon, but nowhere consecutively elaborated—the more ultimate philosophical bearing of what is set forth. All agree, the editor takes the liberty of saying, that judgment is the central function of knowing, and hence affords the central problem of logic; that since the act of knowing is intimately and indissolubly connected with the like yet diverse functions of affection, appreciation, and practice, it only distorts results reached to treat knowing as a self-inclosed and self-explanatory whole—hence the intimate connections of logical theory with functional psychology; that since knowledge appears as a function within experience, and yet passes judgment upon both the processes and contents of other functions, its work and aim must be distinctively reconstructive or transformatory; that since Reality must be defined in terms of experience, judgment appears accordingly as the medium through which the consciously effected evolution of Reality goes on; that there is no reasonable standard of truth (or of success of the knowing function) in general, except upon the postulate that Reality is thus dynamic or self-evolving, and, in particular, except through reference to the specific offices which knowing is called upon to perform in readjusting and expanding the means and ends of life. And all agree that this conception gives the only promising basis upon which the working methods of science, and the proper demands of the moral life, may co-operate. All this, doubtless, does not take us very far on the road to detailed conclusions, but it is better, perhaps, to get started in the right direction than to be so definite as to erect a dead-wall in the way of farther movement of thought.

In general, the obligations in logical matters of the writers are roughly commensurate with the direction of their criticisms. Upon the whole, most is due to those whose views are most sharply opposed. To Mill, Lotze, Bosanquet, and Bradley the writers then owe special indebtedness. The editor acknowledges personal indebtedness to his present colleagues, particularly to Mr. George H. Mead, in the Faculty of Philosophy, and to a former colleague, Dr. Alfred H. Lloyd, of the University of Michigan. For both inspiration and the forging of the tools with which the writers have worked there is a pre-eminent obligation on the part of all of us to William James, of Harvard University, who, we hope, will accept this acknowledgment and this book as unworthy tokens of a regard and an admiration that are coequal.