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 dirTecl for me, and begged, that he would 

 particularly attend to the ftate of the organs in the 

 different birds, which might be fuppofed to contri- 

 bute to ringing. 



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 diffected both cock and hen) that the 

 fame mufcles were ftronger in 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 * 3 when the wild ones do not 



(as 



* Fiih alfo which are fupplied with a conflant fucceffion 

 of palatable food, contiaue in feafoa throughout the greater!: 

 part of the year; trouts, therefore* when confined in a ftew 



Vol. II. Y y and 



