xv iii PREFACE TO THE FIRST EDITION. 



THE PRINCIPLES OF PSYCHOLOGY. 



Vol. I. 



Paet I. The Data of Psychology. — Treating of the 

 general connexions of Mind and Life and their relations to 

 other modes of the Unknowable. 



II. The Inductions of Psychology. — A digest of such 

 generalizations respecting mental phenomena as have already 

 been empirically established. 



III. General Synthesis. — A republication, with addi- 

 tional chapters, of the same part in the already-published Prin- 

 ciples of Psychology. 



IV. Special Synthesis. — A republication, with exten- 

 sive revisions and additions, of the same part, &c. &c. 



V. Physical Synthesis. — An attempt to show the man- 

 ner in which the succession of states of consciousness con- 

 forms to a certain fundamental law of nervous action that 

 follows from the First Principles laid down at the outset. 



Vol. II. 



VI. Special Analysis. — As at present published, but 

 further elaborated by some additional chapters. 



VII. General Analysis. — As at present published, with 

 several explanations and additions. 



VIII. Corollaries.- — Consisting in part of a number of 

 derivative principles which form a necessary introduction to 

 Sociology.* 



Laws of Organic Form," published in the Medico-Chirurgical Review 

 for January, 1859. The germ of Part V. is contained in the essay on 

 " Transcendental Physiology : " See Essays, pp. 280-90. And in Part VI. 

 will be unfolded certain views crudely expressed in a " Theory of Popula- 

 tion," published in the Westminster Review for April, 1852. 



* Respecting the several additions to be made to the Principles of 

 Psychology, it seems needful only to say that Part V. is the unwritten 

 division named in the preface to that work — a division of which the 

 germ is contained in a note on page 544, and of which the scope has since 

 been more definitely stated in a paper in the Medico-Chirurgical Review 

 for Jan. 1859. 



