PREFACE.

ADDITIONS AND CORRECTIONS TO THE ESSAYS AS ORIGINALLY PUBLISHED.
IV.— The Malayan Papilionidæ or Swallow-tailed Butterflies, as illustrative of the Theory of Natural Selection.
135 to 140.	Additions to the discussion on the rank of the Papilionidæ, and on the principles which determine the comparative rank of groups in the animal kingdom.
164	Illustration of variability from Mr. Baker’s revision of the British Roses.
173	Additional facts, on local variations of colour.
196	Additional genus of birds (Ceycopsis) peculiar to Celebes.
199, 200.	Concluding remarks.