The Apostle of Evolution. 181 



they are. When you come to the reprinting of Social 

 Statics, should that -project be persevered in, I should like 

 to put a brief prefatory note stating my present attitude 

 toward it. 



In the essay on Classification of the Sciences which I 

 sent you there is a new generalization respecting the ulti- 

 mate conditions to evolution and dissolution. The arrival 

 at this has led me to see that the second part of First Prin- 

 ciples is by no means complete in its organization, and the 

 result is that I have some thought of reorganizing it. If 

 my intention does not change I may probably set about 

 doing this as soon as I have completed the first volume of 

 the Biology. Part XI will be out in the course of next 

 week, and Part .XII, completing the volumes, I shall 

 probably get finished early in the autumn. If this should 

 be so, and if I should then commence remodelling the 

 second part of First Principles, it may be that by the end 

 of the year I shall want the stereotype plates back. This, 

 however, is problematical ; for if I take this step, I shall 

 not take it until the existing stock of First Principles is 

 sold off, which it may not be at that time. 



I greatly regret that you have had to abandon your 

 project of coming to England for the present. The ruinous 

 rate of exchange is a very sufficient reason. Let us hope 

 that this obstacle may very soon disappear. With wishes 

 that you are by this time quite well again, and with kind 

 regards and thanks to Mrs. Youmans, 



Believe me, very sincerely yours, 



HERBERT SPENCER. 



29 BLOOMSBURY SQUARE, LONDON, June 8, 1864. 

 MY DEAR YOUMANS: When I wrote to you last I be- 

 lieve I had not read the new introductory notice you have 

 written for the volume of the Essays on Progress. Had I 

 done so, I should have expressed to you my indebtedness 

 for the very admirable and judicious way in which you 



