188 NATURAL THEOLOGY. 



of it is produced on the outside of the cheek by the 

 parotid gland, which hes between the ear and the 

 angle of the lower jaw. In order to carry the 

 secreted juice to its destination, there is laid from 

 the gland on the outside a pipe about the thickness 

 of a wheat straw, and about three fingers' breadth 

 in length, which, after riding over the masseter mus- 

 cle, bores for itself a hole through the very middle 

 of the cheek, enters by that hole, w^hich is a com- 

 plete perforation of the buccinator muscle, in to the 

 mouth, and there discharges its fluid very copiously. 

 VI. Another exquisite structure, differing, in- 

 deed, from the four preceding instances in that it 

 does not relate to the conveyance of fluids, but 

 still belonging, like these, to the class of pipes or 

 conduits of the body, is seen in the larynx. We 

 all know that there go down the throat two pipes, 

 one leading to the stomach, the other to the lungs 

 — the one being the passage for the food, the 

 other for the breath and voice : we know also, 

 that both these passages open into the bottom of 

 the mouth — the gullet, necessarily, for the con- 

 veyance of food, and the windpipe, for speech and 

 the modulation of sound, not much less so : there- 

 fore the difficulty was, the passages being so con- 

 tiguous, to prevent the food, especially the liquids, 

 which we swallow into the stomach from entering 

 the windpipe, i. e., the road to the lungs — the 

 consequence of which error, when it does happen, 

 is perceived by the convulsive throes that are in- 

 stantly produced. This business, which is very 



