Igo Luck, or Cunning? 
to Mr. Darwin’s title-page, is what is meant. by natural 
selection. 
Again :— 
“* On the theory of descent with modification, the. great law 
of the long-enduring but not immutable succession of the 
same types within the same areas, is at once explained” 
(p. 340). 
Again :— 
“It must not be forgotten that, on my theory,-all the 
species of the same genus have descended from some one 
species ”’ (p. 341). 
“My theory ’’ became “ our theory ” in 18609. 
Again :— 
““He who rejects these views on the nature of the 
geological record, will rightly reject my whole theory” 
(Pp. 342). . 
“ My ” became “ our ’’ in 1869. 
Again :— 
“ Passing from these difficulties, the other great leading 
facts in paleontology agree admirably with the theory of 
descent with modification through variation and natural 
selection ”’ (p. 343). 
- Again :— 
“The succession of the same types of structure within 
the same areas during the later geological periods ceases 
to be mysterious, and is simply explained by inheritance” 
(Pp. 345). 
I suppose inheritance was not when Mr. Darwin wrote 
considered mysterious. The last few words have been 
altered to ‘‘ and is intelligible on the principle of inheri- 
tance.”’ It seems as though Mr. Darwin did not like 
saying that inheritance was not mysterious, but had no 
objection to implying that it was intelligible. 
The next paragraph. begins—“ If, then, the geological 
record be as imperfect as I believe it to be, . . . the main 
objections to the theory of natural selection are greatly 
