物種起源（英文全本）免費全文閱讀-(英)達爾文無廣告閱讀

fact of

two

distinctly

defined

castes of

sterile

workers

existing

in the

same nest,

both

widely

different

from each

other and

from their

parents,

has

originated.

We can see

how useful

their

production

may have

been to a

social

community

of

insects,

on the

same

principle

that the

division

of labour

is useful

to

civilised

man. As

ants work

by

inherited

instincts

and by

inherited

tools or

weapons,

and not by

acquired

knowledge