the
Orang undergoes according to age and sex. Tiedemann first published an
account of the brain of the young Orang, while Sandifort, Muller and
Schlegel, described the muscles and the viscera of the adult, and gave
the earliest detailed and trustworthy history of the habits of the great
Indian Ape in a state of nature; and as important additions have been
made by later observers, we are at this moment better acquainted with
the adult of the Orang-Utan, than with that of any of the other greater
man-like Apes.

It is certainly the Pongo of Wurmb;* and it is as certainly not the
Pongo of Battell, seeing that the Orang-Utan is entirely confined to
the great Asiatic islands of Borneo and Sumatra. ([Footnote] *Speaking
broadly and without prejudice to the question, whether there be more
than one species of Orang.)

And while the progress of discovery thus cleared up the history of the
Orang, it also became established that the only other man-like Apes in
the eastern world were the various species of Gibbon--Apes of smaller
stature, and therefore attracting less attention than the Orangs, though
they are spread over a much wider range of country, and are hence more
accessible to observation.

Although the geographical area inhabited by the 'Pongo' and Engeco of
Battell is so much nearer to Europe than that in which the Orang and
Gibbon are found, our acquaintance with the African Apes has been of
slower growth; indeed, it is only within the last few years that the
truthful story of the old English adventurer has been rendered fully
intelligible. It was not until 1835 that the skeleton of the adult
Chimpanzee became known, by the publication of Professor Owen's
above-mentioned very excellent memoir 'On the osteology of the
Chimpanzee and Orang', in the 'Zoological Transactions'--a memoir which,
by the accuracy of its descriptions, the carefulness of its comparisons,
and the excellence of its figures, made an epoch in the history of our
knowledge of the bony framework, not only of the Chimpanzee, but of all
the anthropoid Apes.

By the investigations herein detailed, it became evident that the old
Chimpanzee acquired a size and aspect as different from those of the
young known to Tyson, to Buffon, and to Traill, as those of the old
Orang from the young Orang; and the subsequent very important researches
of Messrs. Savage and Wyman, the American missionary and anatomist, have
not only confirmed this conclusion, but have add