1866.] PANGENESIS. 227 



health; thus he wrote to Mr. Wallace (January 1866} : 

 " My health is so far improved that I am able to work one or 

 two hours a day." 



With respect to the 4th edition he wrote to sir Sir J. D. 

 Hooker : 



" The new edition of the * Origin ' has caused me two 

 great vexations. I forgot Bates's paper on variation,* but I 

 remembered in time his mimetic work, and now, strange to 

 say, I find I have forgotten your Arctic paper ! I know how 

 it arose ; I indexed for my bigger work, and never expected 

 that a new edition of the ' Origin ' would be wanted. 



"I cannot say how all this has vexed me. Everything 

 which I have read during the last four years I find is quite 

 washy in my mind." As far as I know, Mr. Bates's paper 

 was not mentioned in the later editions of the * Origin,' for 

 what reason I cannot say. 



In connection with his work on * The Variation of Ani- 

 mals and Plants/ I give here extracts from three letters ad- 

 dressed to Mr. Huxley, which are of interest as giving some 

 idea of the development of the theory of * Pangenesis,' ulti- 

 mately published in 1868 in the book in question :] 



C. Darwin to T. H. Huxley. 



Down, May 27, [1865 ?]. 



... I write now to ask a favour of you, a very great 

 favour from one so hard worked as you are. It is to read 

 thirty pages of MS., excellently copied out and give me, not 

 lengthened criticism, but your opinion whether I may ven- 

 ture to publish it. You may keep the MS. for a month or 

 two. I would not ask this favour, but I really know no one 

 else whose judgment on the subject would be final with me. 



The case stands thus : in my next book I shall publish 

 long chapters on bud- and seminal-variation, on inheritance, 



* This appears to refer to " Notes on South American Butterflies,' 

 Trans. Entomolog. Soc., vol. v. (N.S.). 



