xxxil PREFACE 



is, and always has been, profoundly interesting ; 

 and, considering how recent the really scientific 

 study of that problem, and how great the progress 

 made during the last half century in supplying the 

 conditions for a positive solution of the problem, 

 I cannot doubt that the attainment of such a 

 solution is a mere question of time. 



I am well aware that it has lain far beyond my 

 powers to take any share in this great under- 

 taking. All that I can hope is to have done 

 somewhat towards " the preparation of those who 

 have ceased to be contented with the old and find 

 no satisfaction in half measures " : perhaps, also, 

 something towards the lessening of that great 

 proportion of my countrymen, whose eminent 

 characteristic it is that they find full "full satis- 

 faction in half measures." T. H. H. 



HODESLEA, EASTBOURNE, 

 December 4ta, 1893. 



