10 All the Articles of tJi Darwin Faith. 



and although T think that the importance of the fact has 

 been " much underrated by some writers." 



I believe that my theory of hybridism is right, although 

 it does not "go to the root of the matter" and "no 

 explanation is offered " of the main fact. " Ibrida quo 

 pacto sit" is quite beyond me. 



I believe that " no part of the structure of any one 

 species has been formed for the exclusive good of another 

 species," though " natural selection " can and does often 

 produce structures for the direct injury of other species ; 

 and though I see that the aphis voluntarily uses its 

 structure for the sole good of the ants, and I can only 

 " probably " imagine that it is of any convenience to the 

 aphides themselves. 



I believe that tumbler-pigeons have been produced by 

 the long continued selection of such in many generations, 

 though I can't at all tell how they first came to have the 

 habit, or why it should have been fortunately noticed by 

 some fancier, or how he came to think that it might be 

 propagated and preserved, and succeeded in doing so. 



I believe that I strengthen my argument by saying 

 that dogs only rarely require, when young, to be taught 



