172 APPENDIX. 



one of his replies to Huxley's letters i 1 " I do not 

 doubt your judgment is perfectly just, and I will try 

 to persuade myself not to publish. The whole affair 

 is much too speculative ; yet I think some such view 

 will have to be adopted when I call to mind such 

 facts as the inherited effects of use and disuse," etc. 

 In the theory of pangenesis the gemmules residing in 



Fiff. Z, 



Diagram to fllnslr&te t A, TJarvrfn's theory of pangenesig; B, tbd 

 continuity of tho geriu plisoi . A. An ovum above, full of 

 censmales (only three of whicii are represente* develops into an 

 individual made up of cells, three cf which are shown. These 

 cells give off geonnnieB, which collect and form the rubstance 

 of the ovum of the next RPi-.eration. One can see how the 

 getamulea formed by the body cells xvill be influenced by any 

 change in these. B An ovum gives rise on the one hand to 

 body cells, and oa the ether band to the substance of ths ovara 

 of the next generation. A change in tue somatic cells does noli 

 influence tUo ovuai. 



the body or somatic cells will be subject to such in- 

 fluences as affect the cells, and will naturally transmit 

 any change to which they have been subjected to the 

 offspring that they eventually build up. Darwin's 

 view may be graphically represented by Fig. 2. Since 

 1 " Life and Letters," first edition, vol. iii., p. 44. 



