504 



ARDEIDiE. 



stance in which this structure was wanting, though the bird 

 was examined by those who had found this anatomical pecu- 

 liarity in every example of the species they had previously 

 examined. I am therefore induced to suppose, that as this 

 formation of the vocal organs is known to exist in old females 

 as well as in old males, that, like the occipital crest, neither 

 sex obtain it till they have acquired a certain degree of 

 maturity. 



The representation below is one third less than the natural 

 size. 



