172 APPENDIX. 



one of his replies to Huxley's letters : l " 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 



FIG. 2, 



DlagMrta to illustrate : A, Darwin's theory of pangenesis ; B, the* 

 continuity of the g$rm pbsrn . A. An orum above, full of 

 gemnmles (only three pf which are represen ted develops in to an 

 individual made up of cells, three of which are Shown. These! 

 cells give off gemmules, which collect and form the substance 

 of the ovum of the next gaae'fation. One can see how the 

 getnmulea formed by the body cells will be influenced by any 

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

 body cells, and on the other band to the substance of tha ovum 

 of the next generation. A C&angG in the somatic cella does no* 

 inflgen.ee tUe prum,- 



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* 



