CONCLUSION 53 



N.B. There ought somewhere to be a discussion 

 from Lyell to show that external conditions do vary, 

 or a note to Lyell's works (work ?). 



Besides other difficulties in ii. Part, non -ac- 

 climatisation of plants. Difficulty when asked how 

 did white and negro become altered from common 

 intermediate stock : no facts. We do NOT know that 

 species are immutable, on the contrary. What 

 arguments against this theory, except our not per- 

 ceiving every step, like the erosion of valleys 1 . 



beautiful and most wonderful have been, and are being, evolved." In the 

 2nd edition " by the Creator " is introduced after " originally breathed." 



1 Compare the Origin, Ed. i. p. 481, vi. p. 659, "The difficulty is the 

 same as that felt by so many geologists, when Lyell first insisted that long 

 lines of inland cliffs had been formed, and great valleys excavated, by the 

 slow action of the coast-waves." 



