I2O Instinct and Intelligence 



necting fibres of these centres and of the spinal 

 cord form a complex arrangement of paths by 

 which pre-existing mnemic impressions are 

 brought into harmonious action, and become 

 manifest in purposive instinctive movements. 

 For example, Prof. W. H. Wilson has found 

 that " stimulation of the optic lobes of the large 

 Egyptian iguana produces movements of 

 various parts of the body, and that there is a 

 definite and precise motor localisation in the 

 mid-brain of these reptiles a localisation 

 which is determined by the ending of the tactile 

 tracts (from the body generally) in this part of 

 the brain." 1 



But as with the two lowest classes of verte- 

 brates, so also with reptiles, their brains cannot 

 be said to contain structures to which we can 

 properly apply the term "neopallium "; the 

 development of their cortical or pallial elements 

 has been effected by the flow of energy which 

 reaches them, but the crowning achievement of 

 this process, consisting in the development of 

 a true neopallium, has not been effected by the 

 reptilian brain. The behaviour of this class of 



1 Arris and Gale Lectures, by Prof. Elliot Smith. 



