Schaaffhausen and Busk speak of it as the most brutal of all known human skulls, and as greatly resembling those of apes. One of the Borreby skulls has also this resemblance, but the others are said to exhibit a much higher conformation. The Engis skull is deemed a near approach to the Caucasian type, and appears to possess at the same time a more decided claim to antiquity than that of the Neanderthal. The Borreby skulls belong to the stone period of Denmark, and the people to whom they appertained were probably either contemporaneous with or later than the makers of the kitchen middens. The Engis skull was found in one of the numerous bono caves which border the valley of the Meuse, where the remains of a number of human individuals were discovered, mingled with the bones and teeth of extinct quadrupeds, and with rude stone implements. Dupont in 1864 excavated 43 other caves in the valleys of the Lesso and the Meuse, and discovered in 25 of them numerous human remains, which he has divided into the mammoth, the reindeer, and the neolithic or polished stone period.

Sehaaff hausen, in his exhaustive treatise Ueber die Urform des menschlichen Schddels (Bonn, 1868), argues that the individual to whom the Neanderthal skull belonged must have had a small cerebral development, and uncommon strength of corporeal frame. One of the chief objects of the investigations as to the ago of these remains is to determine whether man is pre-glacial or post-glacial. There is some reason for believing him to be pre-glacial, but not older than the later half of the pliocene period. In 1863 Desnoyers found near St. Prest fossil bones which some consider as coexistent with the elephas meridionalis, while others regard them as comparatively modern. The genuineness of the fossil man of Denise, found in central France, and alleged to have been contemporary with the same extinct animal, is questioned. The human bone of Natchez, Mississippi, which was accompanied by bones of the mastodon and megalonyx, is supported by insufficient scientific testimony; and the human remains in the loess near Maestricht, and near Strasburg, are assigned but hesitatingly to any very remote period of antiquity.

The human remains found in the caves of Languedoc associated with bones of extinct mammalia, and those discovered in March, 1872, by Dr. Riviere in a cave at Mentone, near Nice, may be safely considered as belonging to the post-pliocene period. The antiquity of the human bones in Belgium, as Dupont has shown in his work Les temps antehistoriques en Bel-gique (Brussels, 1871), can also be accepted as dating from times anterior to the neolithic age. Count Pourtales found human remains on the shores of Lake Monroe, in Florida, but as yet no date can bo positively assigned to them. Many hypotheses have been put forward on the presumptive migrations of the prehistoric races; but in the present state of our knowledge no satisfactory conclusion can be reached. Quatrefages considers the pre-Aryan races which are typified by the human remains in the caverns of France as belonging to the Finnish family; Sehaaffhausen is very decided in classifying them with the Celts; Schmerling speculates on Ethiopian affinities; and Huxley sees many analogies between these ancient inhabitants of Europe and the form, condition, and habits of the Australian races.-Besides the works referred to above and in the articles on American Antiquities, Archaeology, Bone Caves, and Lake Dwellings, see Olfers, Lydische Konigs-graber (Berlin, 1859); Lindenschmitt, Die Alterthiimer unserer heidnischen Vorzeit (1863 et seq.); Lartet, Cavernes du Perigord, objcts graves et sculptes des temps prehistoriques dans VEurope occidentale (Paris, 1864); Don Gon-gora y Martinez, Antegiiedades prehistoricas (Madrid, 1868); Figuier,Primitive Man" (1870); Virchow, Die altnordischen Schddel in Kopenhagen (Berlin, 1871); Fergusson, "Rude Stone Monuments of all Ages" (London, 1872); Evans,Ancient Stone Implements (London, 1872); Foster, Prehistoric Races of the United States (Chicago, 1873); and Riviere, Decouverte d'un squelette humain de Vepoque paleolithique (Paris, 1873).