212 LUCK, OR CUNNING? 



reader who read in good faith could doubt that the 

 theory of descent with modification was being here 

 intended. 



" It is just possible ly my theory, that one of two 

 living forms might have descended from the other ; for 

 instance, a horse from a tapir ; but in this case direct 

 intermediate links will have existed between them" 

 (p. 281). 



"My theory" became "the theory" ia 1869. 



Again : — 



" By the theory of natural selection all living species 

 have been connected with the parent species of each 

 genus," &c. We took this to mean, " By the theory 

 of descent with modification all living species," &c. 

 (p. 281). 



Again : — ■ 



" Some experienced conchologists are now sinking 

 many of the very fine species of D'Orbigny and others 

 into the rank of varieties ; and on this view we do find 

 the kind of evidence of change which on my theory we 

 ought to find" (p. 297). 



"My theory" became "the theory" in 1869. 



In the fourth edition (1866), in a passage which is 

 not in either of the two first editions, we read, 

 (p. 359), "So that here again we have undoubted 

 evidence of change in the direction required by my 

 theory." "My theory" became "the theory" in 

 1869; the theory of descent with modification is 

 unquestionably intended. 

 Again : — 

 " Geological research has done scarcely anything 



