It is not its chief object to advocate a particular type of doctrine.

At the same time, as it is impossible to treat of the problems of philosophy except from some point of view, it will be found that, in Chapters III to XI, a doctrine is presented.

It is the same as that presented much more in detail, and with a greater wealth of reference, in my "System of Metaphysics," which was published a short time ago.
In the Notes in the back of this volume, the reader will find references to those parts of the larger work which treat of the subjects more briefly discussed here.

It will be helpful to the teacher to keep the larger work on hand, and to use more or less of the material there presented as his undergraduate classes discuss the chapters of this one.

Other references are also given in the Notes, and it may be profitable to direct the attention of students to them.
The present book has been made as clear and simple as possible, that no unnecessary difficulties may be placed in the path of those who enter upon the thorny road of philosophical reflection.