RAVEN. 



75 



freedom of motion, producing a corresponding variety in 

 the scale of tone. 



The inferior larynx, the true situation of the organ of 

 voice in birds, as the experiments of Baron Cuvier have 



sufficiently proved, is situated at the bottom of the tube, 

 and is formed sometimes by the approximation of several 

 of the lower rings of the trachea more or less firmly 

 ossified together, and occasionally of solid bones ; varying 



