Chapter XII: Part II: {305}

ON THE EVIDENCE FAVOURABLE AND OPPOSED TO THE VIEW THAT SPECIES ARE NATURALLY FORMED RACES, DESCENDED FROM COMMON STOCKS

{305} In the _Origin_ the division of the work into Parts I and II
is omitted. In the MS. the chapters of Part II are numbered afresh,
the present being Ch. I of Pt. II. I have thought it best to call
it Ch. IV and there is evidence that Darwin had some thought of
doing the same. It corresponds to Ch. IX of _Origin_, Ed. i., Ch. X
in Ed. vi.