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or

instincts

of the

fertile

members,

which

alone

leave

descendants.

I am

surprised

that no

one has

advanced

this

demonstrative

case of

neuter

insects,

against

the

well-known

doctrine

of

Lamarck.

SUMMARY. I

have

endeavoured

briefly in

this

chapter to

show that

the mental

qualities

of our

domestic

animals

vary, and

that the

variations

are

inherited.

Still more

briefly I

have

attempted

to show

that

instincts

vary