The skull was characterized by heavy superorbital ridges, a low and receding forehead, protruding and chinless under jaw and the posture was imperfectly erect. This race was widely spread and rather numerous. Some of its blood may have trickled down to the present time and occasionally one sees a skull apparently of the Neanderthal type. The best skull of this type ever seen by the writer belonged to a very intellectual professor in London, who was quite unconscious of his value as a museum specimen. In the old black breed of Scotland the overhanging brows and deep-set eyes are suggestive of this race. Along with other ancient and primitive racial remnants, ferocious gorilla-like living specimens of Paleolithic man are found not infrequently on the west coast of Ireland and are easily recognized by the great upper lip, bridgeless nose, beetling brow with low growing hair and wild and savage aspect. The proportions of the skull which give rise to this large upper lip, the low forehead and the superorbital ridges are certainly Neanderthal characters. The other traits of this Irish type are common to many primitive races. This is the Irishman of caricature and the type was very frequent in America when the first Irish immigrants came in 1846 and the following years. It seems, however, to have almost disappeared in this country. If, as it is claimed, the Neanderthals have left no trace of their blood in living populations, these Firbolgs are derived from some very ancient and primitive race as yet undescribed. In the Upper Paleolithic, which began after the close of the fourth and last glaciation, about 25,000 years ago, the Neanderthal race was succeeded by men of very modern aspect, known as Cro-Magnons. The date of the beginning of the Upper Paleolithic is the first we can fix with accuracy and its correctness can be relied on within narrow limits. The Cro-Magnon race first appears in the Aurignacian subdivision of the Upper Paleolithic. Like the Neanderthals, they were dolichocephalic but with a cranial capacity superior to the average in existing European populations and a stature of very remarkable size. It is quite astonishing to find that the predominant race in Europe 25,000 years ago, or more, was not only much taller, but had an absolute cranial capacity in excess of the average of the present population. The low cranial average of existing populations in Europe can be best explained by the presence of large numbers of individuals of inferior mentality. These defectives have been carefully preserved by modern charity, whereas in the savage state of society the backward members were allowed to perish and the race was carried on by the vigorous and not by the weaklings.