THE DOG. 43 



examine a human brain you will find that the 

 parts which first receive impressions from the 

 nerves of smell are very small and rudimentary ; 

 but in the dog- these olfactory lobes are large and 

 full of ganglia which are connected by innumer- 

 able telegraphic fibres with the main hemispheres 

 of the brain. Hence most of the information we 

 gather comes in through the channels of the other 

 senses, and our ideas of external things are but 

 little based upon the presentation of them offered 

 by the oro-ans of smell. The doer, on the con- 

 trary, forms his notion of the outside world more 

 from impressions gathered in this way than in 

 any other. He may be said, indeed, to think 

 through his nose. 



Now we are able in some degree to understand 

 what an influence this might have upon the whole 

 process of thought when we observe the great 

 difference between ideas concerning external 

 things gathered by people who have all their 

 senses and by those who are absolutely blind or 

 deaf For when the optic nerve hands in nothing 

 whatever to the brain, all the innumerable phases 

 of the external world which can reach us only 

 through the eye can play no part in any of the 

 psychic functions. And in the case of a person 



