CORVIMJ. 



The advantageous size of the organ of voice in the 

 Raven, and its perfect similarity to those of all our song- 

 birds, induced me to select it in illustration of this subject, 

 although in the quality of its tone there is no resemblance ; 

 but it should be borne in mind, that this bird possesses 

 the power of imitating the most difficult of all sounds, 

 the human voice, for which numerous muscles appear to 

 be necessary. The illustrations here given are exactly of 



the same size as the parts themselves will be found in the 

 bird, by any one who is inclined to follow me in the ex- 

 amination. 



The organ of voice in birds may be considered as con- 

 sisting of four parts : the glottis, or superior larynx, the 

 tube of the trachea, the inferior larynx, with its muscles, 



