10 



chalky-film sometimes of considerable thickness. This would serve 

 in the case of the Grebps especially, as a protection against too much 

 damp, their nest being built on the water, sometimes even floating. 



Dull. — The eggs of the Auks and Razor-bills (Alciformes) and of 

 many birds of prey (Accipitriformes) are without polish and dull. 



Granulated. — The eggs of many of the Running birds (Ratike) 

 are very coarse grained and rough, presenting quite a granulated 

 appearance. This structure is also exhibited by the eggs of the 

 Guinea fowl {Numida meleagris). 



SOME OF THE BOOKS IN THE HORNIMAN LIBRARY 

 WHICH RELATE TO BIRDS' EGGS. 



Chapman (F. M.). — Birds' Nests and Eggs : a Guide Leaflet to 

 the Collection in the American Museum of Natural History. New 

 York, 1904. 



Birds' Eggs (pp. 11-13) : Number of Eggs in a " Set " or " Clutch' 

 — Size of Eggs {with plate) — The Shell — Colours of Eggs — Shape of 

 Eggs — Individual Variations. 



Hewitson (W. C). — Coloured Illustrations of the Eggs of British 

 Birds. Third edition. London, 1856. 2 vols. 



Introduction : Pleasures of the Study of Birds^ Eggs^ pp. v.-vi. — 

 Number of Eggs in a " Clutch," pp. vii. and x. — Colours, p. vii. — 

 Protective Colouring, pp. viii.-x. — The Size of EggSy p. x. — The Study 

 as an Aid to the Glasdfication of Birds, pp. xi.-xii. — Individual 

 Variations, pp. xi.-xiii. 



Newton (A.V — A Dictionary of Birds. London, 1893-96. 



Eggs : The Systematic Study of Birds' Eggs (" Oology''), pp. 182-83 

 — The Study as an Aid to the Classification of Birds^ pp. 183-84 — 

 Tho Earliest Collectors, p. 184 — Colours, pp. 184-86 — Nature of the 

 Pigment, pp. 187-88 — Protective Colouring, pp. 188-89 — The Grain 

 of Egg-shells, pp. I8d-9l— The Form of Eggs, p. 191— The Size of 

 Eggs,^^. 191-92. 



Embryology : Formation of the Ovum in the Ovary, pp. 195-96 — Tlie 

 Ovum in the Oviduct, pp. 196-97— T/ie Colour of the Shell, p. 198— 

 Abnormal Eggs, p. 198— ^ou? the Egg is Laid, pp. 198-99. 



