of Dr. A. C. Haddon, went out to the Torres Straits in the year
1897. During this visit we co-operated in collecting material for a
joint paper on the animal cults of Sarawak;[1] and this co-operation,
having proved itself profitable, suggested to us an extension of
our joint program to the form of a book embodying all the information
already to hand and whatever additional information might be obtainable
during the years that one of us was still to spend in Borneo. The
book therefore may be said to have been begun in the year 1898 and
to have been in progress since that time; but it has been put into
shape only during the last few years, when we have been able to come
together for the actual writing of it.

During the year 1899 Dr. A. C. Haddon spent some months in the Baram
district, together with other members of the Cambridge Expedition
(Drs. C. G. Seligmann, C. S. Myers, and Mr. S. Ray); and we wish to
express our obligation to him for the friendly encouragement in, and
stimulating example of, anthropological field work which he afforded
us during that time, as well as for later encouragement and help
which he has given us, especially in reading the proofs of the book
and in making many helpful suggestions. We are indebted to him also
for the Appendix to this book, in which he has stated and discussed
the results of the extensive series of physical measurements of the
natives that he made, with our assistance, during his visit to Sarawak.

We have pleasure in expressing here our thanks to several other
gentlemen to whom we are indebted for help of various kinds -- for
permission to reproduce several photographs, to Dr. A. W. Nieuwenhuis,
the intrepid explorer of the interior of Dutch Borneo, who in his
two fine volumes (QUER DURCH BORNEO) has embodied the observations
recorded during two long journeys in the interior; to Mr. H. Ling Roth