THE DOORS. 163 



In this engraving, A represents the tube or 

 passage leading to the ear drum ; B, the ear 

 drum, or tympanum ; c, the passage from the 

 ear to the throat ; D E F G, the little bones of 

 the ear ; i, the semi-circular canals in the ear - y 

 j, the vestibule ; and K, the cochlea. H refers 

 to a little opening. 



THE NOSE. This is a more important door 

 of the human habitation than many suppose. 

 All or nearly all animal and vegetable bodies 

 are constantly sending off small particles, the 

 quality of which, when they are received at the 

 nose, in its natural state, can in general be easily 

 detected. 



This is undoubtedly one great purpose of 

 this orgaji, and especially of its curious internal 

 structure. For in order that we may detect 

 the nature of the bodies whose particles the air 

 is constantly full of, the inside of this organ of 

 smell is very extensive. 



1. The bones, in some places, project into 

 the nose, like large but irregular shelves. 



2. There is a hollow cavity in each cheek 

 bone, which will hold about half an ounce, and 





