. The bird, its form and function . olutions to the thousand andone problems which offer themselves. What we know inrespect to eggs is fragmentary and rests on so slight adegree of proof that every theory is attacked and re-attacked in turn. Supposing that the eggs of the early forms of birdswere round,—that being the most typical form of a singlecell,—we find many variations in shape among the eggsof living species. Many of the eggs which are laid inhollow trees still retain the primitive spherical form, per-haps an advantage in keeping the eggs in a close groupin the centre of the floor of t

GLIX-115-2CND23P

. The bird, its form and function . olutions to the thousand andone problems which offer themselves. What we know inrespect to eggs is fragmentary and rests on so slight adegree of proof that every theory is attacked and re-attacked in turn. Supposing that the eggs of the early forms of birdswere round,—that being the most typical form of a singlecell,—we find many variations in shape among the eggsof living species. Many of the eggs which are laid inhollow trees still retain the primitive spherical form, per-haps an advantage in keeping the eggs in a close groupin the centre of the floor of t
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. The bird, its form and function . olutions to the thousand andone problems which offer themselves. What we know inrespect to eggs is fragmentary and rests on so slight adegree of proof that every theory is attacked and re-attacked in turn. Supposing that the eggs of the early forms of birdswere round,—that being the most typical form of a singlecell,—we find many variations in shape among the eggsof living species. Many of the eggs which are laid inhollow trees still retain the primitive spherical form, per-haps an advantage in keeping the eggs in a close groupin the centre of the floor of t

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