Clyde, far from resembling that of the Forest Bed, appears to be more recent than that of the ancient deposits of the River Gravels. Amongst this fauna we find neither the _Elephas antiquus_ nor the _Rhinoceros Merckii_; the worked flints are not like those known as belonging to the River-Gravel type, but the relics more nearly resemble those of the Reindeer period of France. It is therefore impossible, in the present state of our knowledge, to assert that man lived in the southwest of England in the Glacial epoch, to the phenomena of which, if he witnessed them, he must eventually have fallen a victim. Our ancestors must constantly have disputed the possession of their caves of refuge with animals, but there is often a certain distinction between those chiefly occupied by man and the mere dens of wild beasts. The latter are generally more difficult of access, and are only to be entered by long, low, narrow, dark passages. Those permanently inhabited by man are wide, not very deep, and they are well lighted. That at Montgaudier, for instance, has an arched entrance some forty-five feet wide by eighteen high. The cave-men had already learnt to appreciate the advantages of air and light. The caves are often of considerable height; that of Massat is some 560 feet high, that of Lherm is 655, that of Bouicheta nearly 755, that of Loubens 820, and that of Santhenay is, as much as 1,344 feet high. Those of Eyziès, Moustier, and Aurignac are also very lofty. As the valleys were hollowed out by the rushing torrents of the Quaternary floods, men sought a home near the waters which were indispensable to their existence, and came to dwell on the shores of rivers. The most ancient of the inhabited caves, therefore, are those on the highest levels, but the difference in the nature of the country and the varying force of geological action have led to so many exceptions, that all we can say with any certainty is that the caves were inhabited at different epochs. That of Montgaudier, for instance, was filled with an accumulation of ooze about forty feet thick. Weapons and tools lay one above the other from the bottom to the top, and it is easy to distinguish the succession of hearths by the blackened earth, cinders, charcoal, and crushed bones lying about them.