So far the story has been that of the sifting out of a humanoid stock
and of the transition to human kind, from the ancestors of apes and men
to the man-ape, and from the man-ape to man. It looks as if the
sifting-out process had proceeded further, for there were several human
branches that did not lead on to the modern type of man.
1. The first of these is represented by the scanty fossil remains known
as _Pithecanthropus erectus_, found in Java in fossiliferous beds which
date from the end of the Pliocene or the beginning of the Pleistocene
era. Perhaps this means half a million years ago, and the remains
occurred along with those of some mammals which are now extinct.
Unfortunately the remains of Pithecanthropus the Erect consisted only of
a skull-cap, a thigh-bone, and two back teeth, so it is not surprising
that experts should differ considerably in their interpretation of what
was found. Some have regarded the remains as those of a large gibbon,
others as those of a pre-human ape-man, and others as those of a
primitive man off the main line of ascent. According to Sir Arthur
Keith, Pithecanthropus was "a being human in stature, human in gait,
human in all its parts, save its brain." The thigh-bone indicates a
height of about 5 feet 7 inches, one inch less than the average height
of the men of to-day. The skull-cap indicates a low, flat forehead,
beetling brows, and a capacity about two-thirds of the modern size. The
remains were found by Dubois, in 1894, in Trinil in Central Java.
2. The next offshoot is represented by the Heidelberg man (_Homo
heidelbergensis_), discovered near Heidelberg in 1907 by Dr.
Schoetensack. But the remains consisted only of a lower jaw and its
teeth. Along with this relic were bones of various mammals, including
some long since extinct in Europe, such as elephant, rhinoceros, bison,
and lion. The circumstances indicate an age of perhaps 300,000 years
ago. There were also very crude flint implements (or eoliths). But the
teeth are human teeth, and the jaw seems transitional between that of an
anthropoid ape and that of man. Thus there was no chin. According to
most authorities the lower jaw from the Heidelberg sand-pit must be
regarded as a relic of a primitive type off the main line of human
ascent.
[Illustration: A RECONSTRUCTION OF THE JAVA MAN
(_Pithecanthropus erectus._)]
3. It was in all probability in the Pliocene that there took origin the
Neanderthal species of man, _Homo neanderthalensis_, first known from
remains found in 1856 in the Neanderthal ravine near Düsseldorf.
According to some authorities Neanderthal man was living in Europe a
quarter of a million years ago. Other specimens were afterwards found
elsewhere, e.g. in Belgium ("the men of Spy"), in France, in Croatia,
and at Gibraltar, so that a good deal is known of Neanderthal man. He
was a loose-limbed fellow, short of stature and of slouching gait, but a
skilful artificer, fashioning beautifully worked flints with a
characteristic style. He used fire; he buried his dead reverently and
furnished them with an outfit for a long journey; and he had a big
brain. But he had great beetling, ape-like eyebrow ridges and massive
jaws, and he showed "simian characters swarming in the details of his
structure." In most of the points in which he differs from modern man he
approaches the anthropoid apes, and he must be regarded as a low type of
man off the main line. Huxley regarded the Neanderthal man as a low form
of the modern type, but expert opinion seems to agree rather with the
view maintained in 1864 by Professor William King of Galway, that the
Neanderthal man represents a distinct species off the main line of
ascent. He disappeared with apparent suddenness (like some aboriginal
races to-day) about the end of the Fourth Great Ice Age; but there is
evidence that before he ceased to be there had emerged a successor
rather than a descendant--the modern man.
4. Another offshoot from the main line is probably represented by the
Piltdown man, found in Sussex in 1912. The remains consisted of the
walls of the skull, which indicate a large brain, and a high forehead
without the beetling eyebrows of the Neanderthal man and
Pithecanthropus. The "find" included a tooth and part of a lower jaw,
but these perhaps belong to some ape, for they are very discrepant. The
Piltdown skull represents the most ancient human remains as yet found in
Britain, and Dr. Smith Woodward's establishment of a separate genus
Eoanthropus expresses his conviction that the Piltdown man was off the
line of the evolution of the modern type. If the tooth and piece of
lower jaw belong to the Piltdown skull, then there was a remarkable
combination of ape-like and human characters. As regards the brain,
_inferred_ from the skull-walls, Sir Arthur Keith says:
All the essential features of the brain of modern man are to be seen
in the brain cast. There are some which must be regarded as
primitive. There can be no doubt that it is built on exactly the
same lines as our modern brains. A few minor alterations would make
it in all respects a modern brain.... Although our knowledge of the
human brain is limited--there are large areas to which we can assign
no definite function--we may rest assured that a brain which was
shaped in a mould so similar to our own was one which responded to
the outside world as ours does. Piltdown man saw, heard, felt,
thought, and dreamt much as we do still.
And this was 150,000 years ago at a modern estimate, and some would say
half a million.
There is neither agreement nor certainty as to the antiquity of man,
except that the modern type was distinguishable from its collaterals
hundreds of thousands of years ago. The general impression left is very
grand. In remote antiquity the Primate stem diverged from the other
orders of mammals; it sent forth its tentative branches, and the result
was a tangle of monkeys; ages passed and the monkeys were left behind,
while the main stem, still probing its way, gave off the Anthropoid
apes, both small and large. But they too were left behind, and the main
line gave off other experiments--indications of which we know in Java,
at Heidelberg, in the Neanderthal, and at Piltdown. None of these lasted
or was made perfect. They represent _tentative_ men who had their day
and ceased to be, our predecessors rather than our ancestors. Still, the
main stem goes on evolving, and who will be bold enough to say what
fruit it has yet to bear!
[Illustration: _After a model by J. H. McGregor._
PROFILE VIEW OF THE HEAD OF PITHECANTHROPUS, THE JAVA APE-MAN--AN EARLY
OFFSHOOT FROM THE MAIN LINE OF MAN'S ASCENT
The animal remains found along with the skull-cap, thigh-bone, and two
teeth of Pithecanthropus seem to indicate the lowest Pleistocene period,
perhaps 500,000 years ago.]
[Illustration: _From the reconstruction by J. H. McGregor._
PILTDOWN SKULL. THE DARK PARTS ONLY ARE PRESERVED, NAMELY PORTIONS OF
THE CRANIAL WALLS AND THE NASAL BONES
Some authorities include a canine tooth and part of the lower jaw which
were found close by. The remains were found in 1912 in Thames gravels in
Sussex, and are usually regarded as vastly more ancient than those of
Neanderthal Man. It has been suggested that Piltdown Man lived 100,000
to 150,000 years ago, in the Third Interglacial period.]
[Illustration: _Reproduced by permission from Osborn's "Men of the Old
Stone Age."_
SAND-PIT AT MAUER, NEAR HEIDELBERG: DISCOVERY SITE OF THE JAW OF
HEIDELBERG MAN
_a-b._ "Newer loess," either of Third Interglacial or of Postglacial
times.
_b-c._ "Older loess" (sandy loess), of the close of Second Interglacial
times.
_c-f._ The "sands of Mauer."
_d-e._ An intermediate layer of clay.
The white cross (X) indicates the spot at the base of the "sands of
Mauer" at which the jaw of Heidelberg was discovered.]