The Metaphysics of a Naturalist 
3 
setting to this new material. The section on the theory of 
pleasure-pain alone contains any considerable amount of pre- 
viously published matter and this is presented first in order to 
illustrate the nature of the data upon the basis of which the theory 
of consciousness and some other philosophical sections were elab- 
orated. The chapters which are here assembled were not, how- 
ever, prepared by the author with reference to each other, and 
this accounts for the large amount of repetition, which the editors 
have not attempted to eliminate. 
A certain amount of interpretation and evaluation has been 
inevitable because of the fragmentary character of much of the 
material and because of the unelaborated state of many of the 
ideas themselves. But it has been the aim as far as possible 
to let Professor Herrick speak for himself. 
In explanation of the heterogeneity and very unequal value 
of these chapters, attention should again be called to the fact 
that no one of them represents a finished product, and the parts 
were written at widely different times under exceedingly various 
conditions. Some of the most valuable passages have been 
extracted from personal letters. Others are taken from frag- 
mentary pencil notes made when he was too ill to write more than 
a few minutes at a time. Some are sections extracted from par- 
tially elaborated drafts of systematic treatises. His papers con- 
tain outlines of four such books. Parts of two of these were quite 
fully written up; but very little of the others had been written. 
He had in preparation a philosophical treatise and published 
some extracts from this work in the philosophical serials shortly 
before his death; others were published immediately thereafter. 
The earlier chapters of the present volume (except the first) 
have been drawn largely from the unpublished materials for this 
work. The later chapters are assembled for the most part from 
the notes for a text-book on ethics, to be entitled. Lectures on 
Conduct: The Principles of Ethics from the Dynamic Point of 
View. 
These fragments suffer, not only from their hasty preparation 
and lack of revision, but also from the absence of the setting 
within which they were elaborated in the author’s mind. Doubt- 
less in the light of current criticism many details of psychological 
or philosophical exposition would be stated differently by the 
author if he were writing today. But the value of these papers 
