ON THE SINGING OF BIRDS. 351 



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 thrushes. 



D. in some owls. 



B. flat in some others. 



These observations furnish five notes, viz. 

 A. B. flat, C. D. and F. to which I can add a 

 sixth, (viz. G.) from my own observations on a 

 nightingale which lived three years in a cage. 

 I can also confirm these remarks of the harpsi- 

 chord-tuner by having frequently heard from 

 the same bird C. and F. 



As one should speak of the pitch of these 

 notes with some precision, the B. flat of the ' 



spinnet I tried them by, was perfectly in tune 

 with the great bell of St. Paul's. 



The following notes, therefore, having been - 



observed in different birds, viz. A. B. flat, C. 

 D. F. and G. the E. is only wanting to com- 

 plete the scale; the six other notes, however, 

 afford sufficient data for making some conjee- \ ' 

 tures, at least, with regard to the key in which 

 birds may be supposed to sing, as these inter- 

 vals can only be found in the key of F. with a 

 sharp third, or that of G. with a flat third. 



