Not far from these caves are those of the Lesse Valley, in which Dupont discovered, in 1864, three different layers of human and other remains, the lowest of which contained the bones of the mammoth, rhinoceros, and other extinct animals, together with flint instruments of the rudest type, instruments of reindeer horn, and a human lower jaw with a marked resemblance to the lower jaw of the higher apes. Another discovery at some little distance away from these caves was made in 1857 in what is called the Neanderthal Cave, in the valley of the Düssel, between Düsseldorf and Elberfeld, which is important, not so much as an indication of the length of time that man has lived on the earth, as of the close resemblance existing between the skulls of human beings in the early Pleistocene era and the skulls of apes. The discovery consisted of a human skull and a number of human bones, together with the bones of the rhinoceros, which latter were subsequently unearthed. The skull was of such a character as to raise the question of whether it was human or not, the forehead being narrow and very low and the projection of the supra-orbital ridges enormously great. The long bones of the skeleton agreed with those of men of the present day in respect to length, but were of extraordinary thickness, and the ridges for the attachment of muscles were developed in an unusual degree, showing that the individual was possessed of great muscular strength, especially in the thoracic neighbourhood. Drs. Schaafhausen and Fuhlrott pointed out that the depression of the forehead was not due to any artificial pressure, as the whole skull was symmetrical, and that the individual must have been distinguished by an extraordinarily small cerebral development as well as uncommon corporeal strength. Professor Huxley considers this Neanderthal skull to be the most ape-like one he ever beheld, and Busk, a great authority, gives valuable reasons for supposing it to be the skull of an individual occupying a position midway between the man and the gorilla or chimpanzee. Huxley has carefully compared the Engis and Neanderthal skulls, and his remarks upon them are given in their entirety in Lyell’s “Antiquity of Man.” From these remarks we gather that the Engis skull was dolichocephalic in form, extreme length 7.7 inches, extreme breadth not more than 5.25 inches, forehead well arched, superciliary prominences well but not abnormally developed, horizontal circumference 20½ inches, longitudinal arc from nasal spine to occipital protuberance 13¾ inches, transverse arc from one auditory foramen to the other, across the middle of the sagittal suture, 13 inches. The Neanderthal skull is so different from the Engis skull that Huxley says “it [Neanderthal] might well be supposed to belong to a distinct race of mankind.” It is 8 inches in extreme length, 5.75 inches in breadth, and only 3.4 inches from the glabello-occipital line to the vertex; the longitudinal arc is 12