LETTERS 



To the Editors of British Birds. 



UNEQUAL WING-STROKES IN FLIGHT. 



Sirs, — I have given up all hope of convincing Mr. Seaby, and he, no 

 doubt, considers me past praying for. But I would ask readers of 

 British Birds to refer to the two figures in the November number 

 (p. 192), and judge for themselves. 



F. W. Headley. 



Sirs, — If photographs are necessary to prove to ornithologists that a 

 bird's two wings do not always have to move with mechanical equality, 

 I beg to submit a photograi:)h (here reproduced) of a Barn-Owl hastily 



leaving a dove-cote. The picture, while technically imperfect, is at 

 least convincing of the point in question, which I must agree with 

 Mr. Seaby {antea, p. 156) can hardly be said of all the photographs 

 published by Mr. Headley (antea, pp. 115, 116, 192). 



Clinton G. Abbott. 



To the Editors of British Birds. 



THE GENERIC NAMES OF OUR SWALLOWS. 

 Sirs, — In the last number of British Birds (pp. 230-1) Mr. Bonhote 

 has criticized my nomenclature of the Swallows. Unfortunately, 

 the International Code of Zoological Nomenclature, which I follow, 

 is very little known in England, and still less so is the interpretation of 

 several of its rules, which have for years been carefully considered by 

 the International Commission on Zoological Nomenclature. Even 

 Mr. Bonhote is not well acquainted with the history and work of this 

 Commission. 



