6H APPENDIX. 



to mark down when he returned home what he had 

 obferved on this head. 



I had lately received an account from him of the 

 following notes in different birds. 



F. natural in woodlarks. 



A. natural in common cocks. 

 C. natural in Bantam cocks. 



B. flat in a very large cock. 



C. falling to A. commonly in the cuckow. 



A. in thrufhes. 



D. in fome owls. 



B. flat in fome others. 



Thefe obfervations furnifh five notes, viz. A. B. 

 flat, C. D. and F. to which I can add a fixth, (viz. 

 G.) from my own obfervations on a nightingale 

 which lived three years in a cage. I can alfo con- 

 firm thefe remarks of the harpfichord-tuner by hav- 

 ing frequently heard from the fame bird C. and F. 



As one mould fpeak of the pitch of thefe notes 

 with fome precifion, the B. flat of the fpinnet I 

 tried them by, was perfectly in tune with the 

 great bell of St. Paul's. 



The following notes, therefore, having been ob- 

 ferved in different birds, viz. A. B. flat, C. D. F. 

 and G. the E. is only wanting to complete the 

 fcale ; the fix other notes, however, afford fufH- 

 cient data for making fome conjectures, at leaft, 

 with regard to the key in which birds may be fup- 

 pofed to fing, as thefe intervals can only be found 



in 



