98 EVOLUTION 



birds and mammals are the only warm- 

 Eloodecl animals, and they show a great 

 heightening of brain^development; jn a.1^ 

 a few primitive forms there 



isjm extremely important, and usually pro- 



mother and tl>p 



THE ASCENT OF MAN. As this final 

 achievement of Vertebrate evolution will be 

 discussed by Dr. Arthur Keith in a special 

 volume of this Library, we need not do more 

 than refer to a few points of general evolu-, 

 tionary interest. 



The real^distinctiyeness of man from his 

 Tigarf s^jjjies depends on his power of build- 



up ger^fal ideas and of controlling his 



He has many 



structural peculiarities, it is true, but the 

 qualities are.-4 n language, 



t anji conduct, and in the finer brain 

 SJated with^ 



The^Descent of Man 5 ' is the expansion 

 of a chapter in the "Origin of Species." In 

 other words, the jeyidqyices of 



froiu^an ancestral type common to him and 



tq 



__ 



As Owen allowed long ago, there is an 

 "all-pervading similitude of structure" be- | 

 tween man and the anthropoid apes; the 



