134 Instinct and Intelligence 



pallium have been evolved from instinctive 

 elements, raised as it were to a higher level in 

 response to the increasing complexity of the 

 environment imposed on the ascending orders 

 of animals in their struggle for existence. 



Although there is much to interest us in fol- 

 lowing the evolution of the brain of the Ungu- 

 lates and Cetacea, it does not enlighten us much 

 as to the connection which exists between the 

 organisation and growth of the neopallium, 

 and the development of an animal's intellectual 

 powers ; we therefore pass on to the order of the 

 Primates, including the Macaque, whose brain 

 has been extensively explored by physiologists, 

 and its neopallium mapped out into well- 

 defined motor and other centres which closely 

 correspond with those of the higher orders of 

 Primates. 



The development of the association areas of 

 a Macaque's brain do not reach the same plane 

 as those which characterise the brain of the 

 baboons ; nevertheless, they are of a higher type 

 than that possessed by a dog ; consequently the 

 reasoning powers displayed by some monkeys 

 are more pronounced than those of a lower class 



