ANIMAL MECHANISM. 293 



bule, or second room. Lower down, but a few lines 

 from this, is the second little parchment head, called 



FENESTRA ROTUNDA. 



This is a round window; were it possible to tear it 

 away, and creep through the frame, the traveller would 

 enter into one of the canals of the cochlea. 

 FIG. 4. 



Explanation of Figure 4. 

 In this diagram, the labyrinth and little bones of the ear, are 



magnified exceedingly. This is to show the manner in which they 



are connected, and the order in which they are placed. 



a to e The malleus, about to be described ; a a long process ; b, 

 a shorter one; c, the handle, attached to the drum head; d, the 

 neck; and e the head of the malleus, like a mallet. 



/to i The inchus ; f its body ; g its short leg ; i the point united 

 to the stapes. 



k to n The stapes ; k its small head, the anterior leg, n the ba- 

 sis connected with the membrane which closes the fenestra ovali^ 



o to m The labyrinth ; o-r, the first turn of the cochlea; s t u v, 

 the second ; w x, the half or third turn ; y the foramen rotundum 

 or round window ; zz, the vestibuluin ; A B C D, superior semi- 

 circular canals, A the ampulla; BC, its curvature ; D, its union 

 with the inferior or posterior cdnal ; E F G H, inferior canal ; E, 

 its ampulla ; F G H, its curious curve and its junction with the 

 first; 1KLM, the exterior canal; I, the ampulla; KL, the 

 direction of its curve; M, its termination in the vestibule. 

 VOL. i. NO. xir. 2G 



