2i5 7hc Irish Naiiira/ist. October, 



OBSERVATIONS O^ THE WEIGHTS OF BIRDS' 



EGGS. 



BY NEVIN H. FOSTER, M.B.O.U. 



I have previously recorded in tlie pages of the I?'ish Nahiralist ^ 

 the measurements and weights of eggs of some 94 species of 

 birds, and these notes are now supplemented by a few which I 

 have been enabled to examine during the past two 3^ears. 

 As on former occasions, except where otherwise stated, the 

 eggs were fresh when weighed ; but in two or three instances 

 the measurements and weights are repeated, owing to previous 

 clutches examined having undergone considerable incuba- 

 lion. 



Chough (^Pyrrhocorax graculus). 



Inch. Inch. Grahis. luch. Inch. Grains. 



1-07 =: 237.^ 1-5 X IT = 23Ii 



i-o8 = 2374 1-5 X ro7 = 224 



ri5 = 246 



Raven {Corvus cor ax). • 



Inch. Inch. Grains. 



Carrion Crow [Corvus corone). Three-quarters hatched. 

 Inch. Inch. Grains. 



An Enghsh-taken clutch. 



Hooded Crow {Corvus comix). 



Inch. Inch. Grains. Almost hatched. 



1-86 X 1-2 = 298 

 173 X it6 = 271I 



1 vol. xi., pp. 237-245 ; vol. xii. pp. 295-297 ; voh xvi., pp. 315-319- 



