yet know what
the men of these communities looked like, because as yet no indisputable
human remains have been found. All the stone implements have been found
on the surface, where they have been brought to light by the wind as it
swept away the loess. These stone-age communities seem to have lasted a
considerable time and to have been spread not only over North China but
over Mongolia and Manchuria. It must not be assumed that the stone age
came to an end at the same time everywhere. Historical accounts have
recorded, for instance, that stone implements were still in use in
Manchuria and eastern Mongolia at a time when metal was known and used
in western Mongolia and northern China. Our knowledge about the
palaeolithic period of Central and South China is still extremely
limited; we have to wait for more excavations before anything can be
said. Certainly, many implements in this area were made of wood or more
probably bamboo, such as we still find among the non-Chinese tribes of
the south-west and of South-East Asia. Such implements, naturally, could
not last until today.

About 25,000 B.C. there appears in North China a new human type, found
in upper layers in the same caves that sheltered Peking Man. This type
is beyond doubt not Mongoloid, and may have been allied to the Ainu, a
non-Mongol race still living in northern Japan. These, too, were a
palaeolithic people, though some of their implements show technical
advance. Later they disappear, probably because they were absorbed into
various populations of central and northern Asia. Remains of them have
been found in badly explored graves in northern Korea.

4 _The Neolithic age_

In the period that now followed, northern China must have gradually
become arid, and the formation of loess seems to have steadily advanced.
There is once more a great gap in our knowledge until, about 4000 B.C.,
we can trace in North China a purely Mongoloid people with a neolithic
culture. In place of hunters we find cattle breeders, who are even to
some extent agriculturists as well. This may seem an astonishing
statement for so early an age. It is a fact, however, that pure pastoral
nomadism is exceptional, that normal pastoral nomads have always added a
little farming to their cattle-breeding, in order to secure the needed
additional food and above all fodder, for the winter.

At this time, about 4000 B.C., the other parts of China come into view.
The neolithic implements of the va