CHAPTER VII.. Instinct.

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, ostrich, and parasitic bees--Slave-making ants--Hive-bee, its cell-making instinct--Difficulties on the theory of the Natural Selection of instincts--Neuter or sterile insects--Summary

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