About fifty years ago the attention of the scientific world was drawn to the flint implements which were scattered over the surface of our fields and in our gravel pits and mountain caves; and inquiring minds began to speculate as to their origin. The collections made at Amiens and Abbeville and other places began to convince men of the existence of an unknown and unimagined race, and it gradually dawned on us that on our moors and downs were the tombs of a race of men who fashioned their weapons of war and implements of peace out of flint. These discoveries have pushed back our knowledge of man to an antiquity formerly never dreamed of, and enlarged considerably our historical horizon. So we will endeavour to discover what kind of men they were, who roamed our fields and woods before any historical records were written, and mark the very considerable traces of their occupation which they have left behind. The condition of life and the character and climate of the country were very different in early times from what they are in the present day; and in endeavouring to discover the kind of people who dwelt here in prehistoric times, we must hear what the geologists have to tell us about the physical aspect of Britain in that period. There was a time when this country was connected with the Continent of Europe, and the English Channel and North Sea were mere valleys with rivers running through them fed by many streams. Where the North Sea now rolls there was the great valley of the Rhine; and as there were no ocean-waves to cross, animals and primitive man wandered northwards and westwards from the Continent, and made their abode here. It is curious to note that the migratory birds when returning to France and Italy, and thence to the sunny regions of Algiers and other parts of Northern Africa, always cross the seas where in remote ages there was dry land. They always traverse the same route; and it appears that the recollection of the places where their ancestors crossed has been preserved by them through all the centuries that have elapsed since "the silver streak" was formed that severs England from her neighbours. In the times of which we are speaking the land was much higher than it is now. Snowdon was 600 feet greater, and the climate was much colder and more rigorous. Glaciers like those in Switzerland were in all the higher valleys, and the marks of the action of the ice are still plainly seen on the rocky cliffs that border many a ravine. Moreover we find in the valleys many detached rocks, immense boulders, the nature of which is quite different from the character of the stone in the neighbourhood. These were carried down by the glaciers from higher elevations, and deposited, when the ice melted, in the lower valleys. Hence in this glacial period the condition of the country was very different from what it is now.