Contributions to the theory of natural selection. A series of essays ... By Alfred Russel Wallace ...

xiv CONTENlTS.
tions to Mr. Bates' Theory of MIimicry-Mimicry by Female Insects
only-Cause of the dull Colours of Female Birds-Use of the gaudy
Colours of many Caterpillars-Summary-General deductions as to
Colour in Nature-Conclusion.... Pp. 45-129
IV. —The Malayan Papilionidce, or Swallow-tailed Butteiflies,
as illustrative of the Theory of Natural Selection.
Special value of the Diurnal Lepidoptera for inquiries of this NatureQuestion of the rank of the Papilionidch-Distribution of the PapilionidT-Definition of the word Species-Laws and Modes of Variation - Sinple Variability-Polymorphism or Dimorphism- Local
form or variety-Co-existing Variety-Race or Subspecies-Species
-Variation as specially influenced by Locality-Local Variation of
Size —Local Variation of Form-Local Variations of Colour-Remarks on the facts of Local Variation -Mimicry - Concluding
Remarks on Variation in Lepidoptera-Arrangement-Geographical
Distribution-Remarkable peculiarities of the island of CelebesConcluding Remarks.. Pp. 130 —200
V.-On Instinct in.Mcan and Animals.
How Instinct may be best Studied-Deffinition of Instinct-Does Man
possess Instincts?-IIow Indians travel through unknown and trackless Forests..... Pp. 201-210
VI. —The Philosophy of Birds' Nests.
Instinct or Reason in the Construction of Birds' Nests-Do Men build
by Reason or by Imitation? —;Why does each Bird build a peculiar
kind of Nest?-How do young Birds learn to build their first Nest?
Do Birds sing by Instinct or by Imitation?-Man's Works mainly
Imitative-Birds do Alter and Improve their Nests when altered conditions require it-Conclusion... Pp. 211-230
VII.-A Theory of Birds' Nests; showing the relation of certain
differences of colour in female birds to their mode of nidification.
Changed Conditions and persistent Habits as influencing NidificationClassification of Nests-Sexual differences of Colour in Birds-The
Law which connects the Colours of Female Birds with the mode of
Nidification-What the Facts Teach us-Colour more variable than