I903- 295 



OBSERVATIONS ON THE WEIGHTS OF BIRDS' EGGS. 



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



In the Irish Naturalist (vol. xi., pp. 237-245), I gave measure- 

 ments and weights of the eggs of fifty-six species of birds, 

 and during the past season have been able to secure particulars 

 of thirteen other species, of which I now give results. 



As in my previous article, each set weighed was taken from 

 one nest, and in those cases where the eggs had undergone 

 a perceptible period of incubation, it is so stated; those 

 unmarked being fresh specimens. 



LonG-TAII<b;d Tit {^Acredula caiUata). 



Inch. Incli. Grains. 

 *53 X '43 — \i\ (| hatched). 

 The Yew tree in which this beautiful nest had been built was cut down, 

 and in its fall all the eggs were broken except the one. 



Tr:BE Creeper {Certhia familiaris). 



Inch. Inch. Grains. Inch Inch. Grains. 



•65 X -45 - I7i '63 X -48 - i8i 



•63 X '47 — 17^ -62 X -48 — i8i 



•62 X '49 - 19 "63 X -48 — 18 



House Martin {Chelidon urbicd). 



Inch. Inch. Grains. Inch. Inch, Grains. 



•77 X '55 - 31^ 75 X -55 - 30J 



•75 X '55 - 31 76 X '54 - 30 



Goi^DFlNCH {Carduelis elegans), 



Carlow clutch. King's Co. clutch. 



Inch. Inch. Grains. Inch. 



•67 X -51 - 23i ^ 7 

 •62 X '53 - 23 72 



•64 X '5 - 22 72 



•66 X '49 — 21^ 72 



Canary {Serijius canarid) 



Inch. Inch. Grains. Inch. 



72 X -53 - 23 72 



•74 X -54 - 23i -69 



•7 X '54 - 26^ 



