110 SPECIES NOT 



Thwaites and Mr. II. C. Watson, of plants from 

 Ceylon and the Azores. 



As no references are given of these experiments, 

 it is presumed they are not published, and con- 

 sequently cannot form part of my argument. 



The cases of migration of animals from warmer 

 to cooler climates are merely given on hearsay, 

 and we shall see hereafter the glacial theory 

 brought forward to account for the wide separation 

 of species from their assumed centres of origin. 



Correlation of growth in this chapter receives 

 a more extended notice than it has hitherto 

 done, and some of the more remarkable views 

 held by Mr. Darwin are developed. The points 

 detailed in the first part of the chapter I have 

 before alluded to. I will confine myself now to 

 the consideration of two propositions which rise 

 out of Mr. Darwin's views of correlation, and 

 upon which he lays much stress. 



1. "J part developed in any species in an 

 extraordinary manner, in comparison with the 

 same part in allied species, tends to be highly 

 variable. 11 (Page 150.) 



Here Mr. Darwin is obliged from the limit of 

 his work, to defer the facts upon which he in- 

 tends to support this proposition. This is unfor- 

 tunate, because in the outset it is clear that it 

 bears strongly upon the unavoidable result of 

 Mr. Darwin's views, that the human race is only 

 a modification or higher development of that of 

 the ape. Mr. D. infers that Mr. Owen is a be- 

 liever in the proposition, from an observation 



