It is not until we come to sands that are almost a quarter of a million years old that we find any other particle of a sub- human being. But there are plenty of implements, and they are steadily improving in quality as we read on through the record. They are no longer clumsy Eoliths; they are now shapely instruments made with considerable skill. And they are much bigger than the similar implements afterwards made by true man. Then, in a sandpit at Heidelberg, appears a single quasi-human jaw-bone,