164 GLIMPSES OF NATURE. 



thing of the acute nature of the sense of smell in man, 

 relatively to our particles of musk. 



But that the dog's sense of smell is infinitely more 

 delicate than our own is evident. Your collie tracks 

 out your footsteps by the odour they have given off 

 amidst a dense crowd of people. " Spotty" recognises 

 the tread of the cat by reason of the fine particles 

 which the feline impression has left behind it, and 

 which appeal to his nerves of smell while all unrecog- 

 nised by us. The bloodhound, in the same way, with 

 keen scent, traces out the resemblance in smell between 

 the footsteps of the criminal and those of the garment 

 which belonged to the evildoer. 



The dog's brain shows large lobes of smell, and big 

 nerves emanating therefrom. His nervous apparatus 

 in this respect makes for him a world of odours all 

 unappreciated by his master. As there are many other 

 worlds than our own whirling round in the blue ether, 

 so in truth, in lower life, there are many other more 

 powerful and more acute senses than ours. 



