58 A Century of Science 



responsibility. Some doubt has recently been ex 

 pressed whether Mr. Spencer woidd admit the force 

 of this argument. It has been urged by Mr. S. H. 

 Wilder, in two able papers published in the &quot; New 

 York Daily Tribune,&quot; June 13 and July 4, 1890, 

 that the use of this argument marks a radical 

 divergence on my part from Mr. Spencer s own 

 position. 



It is true that in several passages of &quot; First Prin 

 ciples &quot; there are statements which either imply or 

 distinctly assert that motion can be transformed 

 into feeling and thought, e. y. : &quot; Those modes of 

 the Unknowable which we call heat, light, chemi 

 cal affinity, etc., are alike transformable into each 

 other, and into those modes of the Unknowable 

 which we distinguish as sensation, emotion, thought ; 

 these, in their turns, being directly or indirectly re- 

 transformable into the original shapes ; &quot; 1 and again, 

 it is said &quot;to be a necessary deduction from the 

 law of correlation that what exists in consciousness 

 under the form of feeling is transformable into 

 an equivalent of mechanical motion,&quot; etc. 2 Now, 

 if this, as literally interpreted, be Mr. Spencer s 

 deliberate opinion, I entirely dissent from it. To 

 speak of quantitative equivalence between a unit 



1 First Principles, second edition, 1867, p. 217. 



2 Id. p. 558. 



