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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. • - • • • - Page 319

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