BIRDS--_concluded_.
The immature plumage in relation to the character of the
plumage in both sexes when adult--Six classes of cases--Sexual
differences between the males of closely-allied or
representative species--The female assuming the characters of
the male--Plumage of the young in relation to the summer and
winter plumage of the adults--On the increase of beauty in the
Birds of the World--Protective colouring--
Conspicuously-coloured birds--Novelty appreciated--
Summary of the four chapters on birds 183-238