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CHAPTER VIII.

INSTINCT.

Instincts comparable with habits, but different in their origin,

Instincts graduated-Aphides and ants—Instincts variable-
Domestic instincts, their origin — Natural instincts of the
cuckoo, Molothrus, ostrich, and parasitic bees-Slave-making
ants-Hive-bee, its cell-making instinct-Changes of instinct
and structure not necessarily simultaneous-Difficulties of the
theory of the Natural Selection of instincts-Neuter or sterile
insects--Summary .

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