PREFACE. Vll 



chapters are given in strict connection, and the author 

 would solicit from those who may turn to them the 

 same sequence in perusal — a following of the argu- 

 ment from beginning to end and in the order enunci- 

 ated. What appears unsatisfactory under one section 

 may receive further elucidation under another, and 

 what startles at the outset may be accepted without 

 reserve at a future stage of the exposition. Man's 

 Where, Whence, and Whithek, are inseparably 

 linked together, and there can be no intelligent appre- 

 ciation of the one without a competent knowledge of 

 the others — no successful dealing with one problem 

 unless studied in connection with the other problems 

 that arise from a philosophical consideration of the 

 whole question of Man's place in nature. 



Edinburgh, September 1867. 



