NOTE-BOOK OF 1837. 7 



Speaking elsewhere of intermediate forms, he remarks : 



" Opponents will say show tJiem me. I will answer yes, if 

 you will show me every step between bulldog and grey- 

 hound." 



Here we see that the case of domestic animals was already 

 present in his mind as bearing on the production of natural 

 species. The disappearance of intermediate forms naturally 

 leads up to the subject of extinction, with which the next 

 extract begins. 



" It is a wonderful fact, horse, elephant, and mastodon, 

 dying out about same time in such different quarters. 



" Will Mr. Lyell say that some [same ?] circumstance killed 

 it over a tract from Spain to South America? (Never.) 



" They die, without they change, like golden pippins ; it is 

 a generation of species like generation of individuals. 



" Why does individual die ? To perpetuate certain peculi- 

 arities (therefore adaptation), and obliterate accidental varieties, 

 and to accommodate itself to change (for, of course, change, 

 even in varieties, is accommodation). Now this argument 

 applies to species. 



" If individual cannot propagate he has no issue so with 

 species. 



" If species generate other species, their race is not utterly cut 

 off: like golden pippins, if produced by seed, go on other- 

 wise all die. 



"The fossil horse generated, in South Africa, zebra and 

 continued perished in America. 



" All animals of same species are bound together just like 

 buds of plants, which die at one time, though produced either 

 sooner or later. Prove animals like plants trace gradation 

 between associated and non-associated animals and the story 

 will be complete." 



Here we have the view already alluded to of a term of life 

 mpressed on a species. 



But in the following note we get extinction connected with 



