APPENDIX. 67 



I procured a cock nightingale, a cock and hen 

 blackbird, a cock and hen rook, a cock linnet, as 

 alfo a cock and hen chaffinch, which that very emi- 

 nent anatomift, Mr. Hunter^ F. R. S. was fo oblig- 

 ing as to diiTecl: for me, and begged, that he would 

 particularly attend to the date of the organs in the 

 different birds, which might be fnppofed to contri- 

 bute to finging. 



Mr. Hunter found the mufcles of the larynx 

 to be ftronger in the nightingale than in any other 

 bird of the fame fize •, and in all thofe inftances 

 (where he dilTected both cock and hen) that the 

 fame mufcles were (trongerin the cock. 



I fent the cock and hen rook, in order to fee 

 whether there would be the fame difference in 

 the cock and hen of a fpecies which did not fing 

 at all. Mr. Hunter * however, told me, that he 

 had not attended fo much to their comparative or- 

 gans of voice, as in the other kinds -, but that, to 

 the bed of his recollection, there was no difference 

 at all. 



Strength, however, in thefe mufcles, feems not 

 to be the only requifite •, the birds muft have alfo 

 great plenty of food, which feems to be proved 

 fufficiently by birds in a cage finging the great- 

 eft part of the year *, when the wild ones do not 



(as 



* Fifli alfo which are fupplied with a conftant fuccefliort 

 of palatable food, continue in feafoa throughout the greateft 

 part of the year ; trouts, therefore, when confined in a (lew 



Vol. II. Y y *** 



