It was only natural that the systematic study and classification of the manufactures of the ancient workers in flint should be first carried out in regions such as the Danish peninsula, geologically related to the Cretaceous period, and abounding in the material which most readily adapts itself to the requirements of an implement-maker ignorant of the arts of metallurgy. But the same inexhaustible store of raw material was available to the “Flint-folk,” whose implements have become so familiar by reason of more recent disclosures, of France and England, belonging to a period when the climate, the physical geography, and the whole animal life of Western Europe, contrasted in every respect with anything we have knowledge of in remotest historic times. Those rude examples of primitive art lie alongside of the unwrought flint in such profusion that the examples of them already accumulated in the museums of Europe and America amount to many thousands. But now that attention has been thus widely drawn to their character and significance, it is found that implements of the same class not only abound in regions geologically favourable to their production, but they occur in nearly every country in Europe, and on widely scattered localities in Asia and Africa, where no such natural resources were available for their manufacture. The earliest known type of primitive flint implements, illustrative of a class now very familiar to archæologists, was accidentally recovered from the quaternary gravel beds of the Thames valley, in the heart of Old London, before the close of the seventeenth century. It is a well-made spear-pointed implement, with an unusually tapering point, while the butt-end is broad and roughly fashioned, so that it could be used in the hand without any haft as a spade or hoe. The deposit in which it lay would now be accepted as unquestionable evidence of its Palæocosmic age; but at the date of its discovery, the Celtic era was regarded as that to which all oldest traces of European man pertained. This interesting relic is accordingly described in the Sloane Catalogue of the British Museum as “a British weapon, found with elephant’s tooth, opposite to Black Mary’s, near Gray’s Inn Lane.” In 1797, another and highly interesting discovery of the same class was communicated to the Society of Antiquaries of London by one of its members, Mr. John Frere.[15] In this case a large number of palæoliths were found lying at a depth of twelve feet from the surface, in a gravelly soil containing fresh-water shells and bones of great size. Subsequent excavations in the same locality, at Hoxne, Suffolk, confirm the presence there of the bones of the mammoth, as well as of the fossil horse and the deer. Mr. Frere was so strongly impressed with the evidence of antiquity that he inclined to assign the implements to a remote age, “even beyond that of the present world.” By this, however, he probably meant no more than M.