240 THE EEASOK 'fl'HY. 



* And the Lord God formed man of the dust of the ground, and breathed into 

 his nostrils the breath of life ; and man became a living soul." GENESIS n. 



contact with the filaments of the olfactory nerve, which are spread 

 out upon the walls of the nostrils, and those nerves transmit 

 impressions to the brain, constituting what we call the odexr of 

 mbstances. 



Fig. 60. SHOWIKG THE DIBTKIBTTTION OP THE NEEVOUS FILA31EXTS UPOW 

 SENSITIVE MEMBRANES. 



A. The olfa-:tory nerve, distributed in minute branches upon the membrane 

 of the nostril. 



B. The bulb of the olfactory nerve. 



C. The roots from which the olfactory nerve originates. 



L> E. Nerves of tlu palate, showing the manner in which they arc passed 

 through the bones of the roof of the mouth. 



993. Why do hairs grow across the passages of the 

 nostrils ? 



Because they form a defence against the admission of dust and 

 Insects, which would otherwise frequently irritate U - e nc*voua 

 structure of the nose. 



99i. Why are the nostrils directed downwards? 

 Because, as odows and effluvia ascend, the nose IB directed 



