Origin of Species Variorum

→ Changes of instinct and structure not necessarily simultaneous— Difficulties 1869 1872

Difficulties on the theory 1859 1860

Changes of instinct and structure not necessarily simultaneous— Difficulties on the theory 1861 1866

→ theory of the Natural 1869 1872

Natural 1859 1860 1861 1866

→ INSTINCTS might have been worked into the previous chapters; but I thought that it would be more convenient to treat the subject separately, especially as 1869

THE subject of instinct might have been worked into the previous chapters; but I have thought that it would be more convenient to treat the subject separately, especially as 1859 1860 1861 1866

MANY instincts are 1872

→ an instinct so wonderful as that of the construction of the comb by the hive-bee 1869

so wonderful an instinct as that of the hive-bee making its cells 1859 1860 1861 1866

so wonderful that their development 1872

→ have occurred to many readers, as 1859 1860 1861 1866 1869

appear to the reader 1872

→ qualities of animals within 1859 1860 1861 1866 1869

faculties in animals of 1872

CHAPTER

VIII.

VII.

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,

ostrich,

and parasitic bees—

Slave-making-ants—

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.

→INSTINCTS might have been worked into the previous chapters; but I thought that it would be more convenient to treat the subject separately, especially as →an instinct so wonderful as that of the construction of the comb by the hive-bee will probably →have occurred to many readers, as a difficulty sufficient to overthrow

the

whole theory. I

may here

must

premise, that I have nothing to do with the origin of the

~~primary~~

primary

mental powers, any more than I have with that of life itself. We are concerned only with the diversities of instinct and of the other mental →qualities of animals within the same class.

I will not attempt any definition of instinct. It would be easy to show that several distinct mental actions are commonly embraced by this term; but every one understands what is meant, when it is said that instinct impels the cuckoo to migrate and to lay her eggs in other birds' nests. An action, which we ourselves

~~should~~

should

require experience to enable us to perform, when performed by an animal, more especially by a very