[_Note._--This study of a gibbon was suggested by the writings of
Mr Wallace, the veteran natural philosopher, still alive, who
shares with Charles Darwin the honour of proposing the theory of
Natural Selection. His writings not being at hand where this is
written, his exact words cannot be quoted; but certainly it was
because he intimated in some way how much was to be learned by the
observation of an adolescent orang-outang, domesticated under
natural conditions, that I undertook the upbringing and education
of a young gibbon when it was offered to me. The results, for
which much of the credit belongs to my wife, seem to justify
completely the shrewd anticipations of Wallace.]