8 RESPIRATORY ORGANS. 



But although the digestive organs are thus obviously of the 

 greatest importance to the ornithologist, the others must not 

 be neglected ; and, although 1 am unwilling to impose more 

 labour upon my readers than is necessary, I think it time to 

 introduce to their notice the apparatus by which respiration is 

 performed, and the organs which are subservient to the pro- 

 duction of those varied sounds by which birds express their 

 desires, antipathies, and pleasures. No place can be better 

 suited for this purpose than the commencement of a volume 

 containing the Song Birds, nor any means more efficient than 

 those employed in the following Lesson, the results of which 

 may form a basis for more extended observations. 



