288 WORK ON 'MAN.' [1869 



of Cader, right opposite. Old Cader is a grand fellow, and 

 shows himself off superbly with every changing light. We 

 remain here till the end of July, when the H. Wedgwoods 

 have the house. I have been as yet in a very poor way ; it 

 seems as soon as the stimulus of mental work stops, my whole 

 strength gives way. As yet I have hardly crawled half a 

 mile from the house, and then have been fearfully fatigued. 

 It is enough to make one wish oneself quiet in a comfortable 

 tomb." 



With regard to the fifth edition of the ' Origin,' he wrote 

 to Mr. Wallace (January 22, 1869) : 



" I have been interrupted in my regular work in prepar- 

 ing a new edition of the ' Origin,' which has cost me much 

 labour, and which I hope I have considerably improved in 

 two or three important points. I always thought individual 

 differences more important than single variations, but now I 

 have come to the conclusion that they are of paramount im- 

 portance, and in this I believe I agree with you. Fleeming 

 Jenkin's arguments have convinced me." 



This somewhat obscure sentence was explained, February 

 2, in another letter to Mr. Wallace : 



u I must have expressed myself atrociously ; I meant to 

 say exactly the reverse of what you have understood. F. Jen- 

 kin argued in the ' North British Review ' against single 

 variations ever being perpetuated, and has convinced me, 

 though not in quite so broad a manner as here put. I always 

 thought individual differences more important ; but I was 

 blind and thought that single variations might be preserved 

 much oftener than I now see is possible or probable. I men- 

 tioned this in my former note merely because I believed that 

 you had come to a similar conclusion, and I like much to be 

 in accord with you. I believe I was mainly deceived by 

 single variations offering such simple illustrations, as when 

 man selects." 



The late Mr. Fleeming Jenkin's review, on the ' Origin of 

 Species,' was published in the 'North British Review' for 

 June 1867. It is not a little remarkable that the criticisms. 



