It will be seen at a glance that the Neanderthal skull, especially in the frontal part, which is the chief seat of intelligence, is nearer to the chimpanzee than to modern man. And all the other characters correspond to this inferiority of brain. The enormous superciliary ridges; the greater length of the fore-arm; the prognathous jaws, larger canine teeth, and smaller chin; the thicker bones and stronger muscular attachments; the rounder ribs; the flatter tibia, and many other characters described by palæontologists, all point in the same direction, and take us some considerable way towards the missing link which is to connect the human race with animal ancestors. Still there are other considerations which must make us pause before asserting too positively that in following Quaternary man up to the Canstadt type, we are on the track of original man, and can say with confidence that by following it up still further we shall arrive at the earlier form from which man was differentiated. In the first place, Europe is the only part of the world where this Canstadt type has hitherto been found. We have abundant evidence from palæolithic stone implements that man existed pretty well over the whole earth in early Quaternary times, but have hitherto no evidence from human remains outside of Europe from which we can draw any inference as to the type of man by whom these implements were made. It is clear that in Europe the oldest races were dolichocephalic, but we have no certainty that this was the case in Asia, in so many parts of which round-headed races exclusively prevail, and have done so from the earliest times. Again, we have no evidence as to the origin of another of the most strongly marked types, that of the Negro, or of the Negrito, Negrillo, Bushmen, Australian, or other existing races who approach most nearly to the Simian type. The only evidence we have of the type of races who were certainly early Quaternary, and may very possibly go back to an older geological age than that of the men of Neanderthal and Spy, comes from the New World, from California, Brazil, and Buenos Ayres, and points to a type not so savage and Simian as that of Canstadt, but rather to that which characterizes all the different varieties of American man, though here also we find evidence of distinct dolichocephalic and brachycephalic races from the very earliest times. Another difficulty in the way of considering the Canstadt type as a real advance towards primitive man and the missing link, arises from the totally different and very superior type of Cro-Magnon being found so near it in time, as proved by the existence in both of the cave-bear, mammoth, and other extinct animals. We can hardly suppose the Cro-Magnon type to have sprung by slow evolution in the ordinary way of direct succession, from such a very different type as that of Canstadt during such a short interval of time as a small portion of one geological period.