2 PREFACE. 



could be published in a consecutive form ; this is the chapter 

 which was intended for the " Origin of Species/' and which, 

 for the sake of reference, I have added as an Appendix to my 

 present work. For the rest, the numerous disjointed para- 

 graphs and notes which I found among the MSS I have 

 woven into the text of this book, feeling on the one hand 

 that they were not so well suited to appear as a string of 

 disconnected passages, and on the other hand that it was 

 desirable to publish them somewhere. I have gone through 

 all the MSS carefully, and have arranged so as to introduce 

 every passage in them of any importance which I find to 

 have been hitherto unpublished. In no case have I found 

 any reason to suppress a passage, so that the quotations which 

 I have given may be collectively regarded as a full supple- 

 mentary publication of all that Mr. Darwin has written in the 

 domain of psychology. In order to facilitate reference, I have 

 given in the Index, under Mr. Darwin's name, the numbers of 

 all the pages in this work where the quotations in question 

 occur. 



18, COEXWALL TeEEACE, 



Regent's Paek, London, N.W., 

 November, 1883. 



