PREFACE. 



The treatise which follows has in the main grown up in 

 connection with the author's class-room instruction in 

 Psychology, although it is true that some of the chapters 

 are more * metaphysical,' and others fuller of detail, than 

 is suitable for students who are going over the subject for 

 the first time. The consequence of this is that, in spite of 

 the exclusion of the important subjects of pleasure and 

 pain, and moral and aesthetic feelings and judgments, the 

 work has grown to a length which no one can regret more 

 than the writer himself. The man must indeed be sanguine 

 who, in this crowded age, can hope to have many readers 

 for fourteen hundred continuous pages from his pen. But 

 icer Vieles bringt wird Manchem eticas hringen : and, by judi- 

 ciously skipping according to their several needs, I am sure 

 that many sorts of readers, even those who are just begin- 

 ning the study of the subject, will find my book of use. 

 Since the beginners are most in need of guidance, I sug- 

 gest for their behoof that they omit altogether on a first 

 reading chapters 6, 7, 8, 10 (from page 330 to page 371), 

 12, 13, 15, 17, 20, 21, and 28. The better to awaken the 

 neophyte's interest, it is possible that the wise order would 

 be to pass directly from chapter 4 to chapters 23, 24, 25, 

 and 26, and thence to return to the first volume again. 

 Chapter 20, on Sj)ace-perception, is a terrible thing, which, 

 unless written with all that detail, could not be fairly 

 treated at all. An abridgment of it, called * The Spatial 

 Quale,' which appeared in the Journal of Speculative 

 Philosophy, vol. xiii. p. 64, may be found by some per- 

 sons a useful substitute for the entire chapter. 



I have kept close to the point of view of natural science 

 throughout the book. Every natural science assumes cer- 



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