During the reindeer epoch, man wrought the flint to better effect than in the preceding period. He also manufactured somewhat remarkable implements in bone, ivory, and reindeers' horn. In the preceding period, human bones were found in caves, mixed up indiscriminately with those of animals; in the epoch we are now considering, this promiscuous intermingling is no longer met with. We shall first pass in review man as existing in this epoch, in respect to his habitation and food. We shall then proceed to speak of the productions of his industry, and also of the earliest essays of his artistic genius. Lastly, we shall briefly consider his physical organisation. With respect to his habitation, man, during the reindeer epoch, still took up his abode in caves. According to their depth and the light penetrating them, he either occupied the whole extent of them or established himself in the outlet only. About the centre of the cavern some slabs of stone, selected from the hardest rocks, such as sandstone or slate, were bedded down in the ground, and formed the hearth for cooking his food. During the long nights of winter the whole family must have assembled round this hearth. Sometimes, in order the better to defend himself against the various surprises to which he was exposed, the man of the reindeer epoch selected a cavern with a very narrow inlet which could only be entered by climbing. A cave formed naturally in the deepest clefts and hollows of some rock constituted, in every climate, the earliest habitation of man. In cold climates it was necessary for him to find some retreat in which to pass the night, and in warmer latitudes he had to ward off the heat of the day. But these natural dwellings could only be met with in districts where rocks existed which offered facilities for cover in the way of clefts and holes. When man took up his abode in a level country, he was compelled to construct for himself some place of shelter. By collecting together stones, brought from various directions, he then managed to build an artificial cavern. Choosing a spot where some natural projection overhung the ground, he enlarged, as far as he was able, this natural roof, and, bringing art to the assistance of nature, he ultimately found himself in possession of a convenient retreat. We must not omit to add that the spot in which he established his dwelling was always in the vicinity of some running stream. In this way, therefore, the inhabitants of the plains formed their habitations during the epoch which we are considering.