The astonishing thing about this half-jaw from Piltdown is that it is definitely and obviously more like that of a chimpanzee--especially a young chimpanzee--than it is like that of a man (see Fig. 23, A, B, and C and their explanation). If it had been found under other circumstances it might quite well have been described as the jaw of a simiid--a large ape allied to the chimpanzee--with some unimportant resemblance to a human one. The front part of the bony jaw of Piltdown, instead of forming a narrow ridge below the protruding bony chin as in man, is wide and flat; there is no protruding chin. This very important fact is shown in our Fig. 24, in which the lower margin of the lower jaw of modern man, of the chimpanzee and of the Piltdown specimen are compared. The jaw ended in front in a wall of bone sloping forward and upward continuously from the flat and broad lower surface of the jaw. In this the great incisor teeth were set, as in all Simiids. In man, on the contrary, the front group of teeth is much smaller than in the apes, and the semicircle formed by the line of the gums is much smaller than the semicircular lower margin of the jaw. The semicircle of teeth in man retreats (as it were) behind the front part of the bony jaw which is left projecting far in advance of the line of teeth, forming the "chin" or "chin protuberance." The Piltdown jaw when found had only two of the cheek-teeth in place, as shown in Fig. 25. They were certainly very human in pattern and in the smoothness of their worn surfaces. But it was found impossible to fill the front part of the bony jaw with the missing teeth if they also were fashioned according to human pattern. They would in that case only reach along the jaw to a distance of an inch and three-fifths from the first molar tooth, whereas to fill the space from that tooth up to the front end of the bone in which the teeth are socketed they must be big enough to occupy a length of two inches and two-fifths (consult Fig. 25 and its explanation). Dr. Smith Woodward did not hesitate, in view of the shape of the jaw so closely like that of a chimpanzee, to postulate the former existence in it of big front teeth--canines and incisors--like those of a chimpanzee, and unlike those of man, although there was no trace of them left in the specimen. He restored the jaw, giving it very much the shape and the teeth of a chimpanzee's jaw (Fig. 23, B). That this was a correct interpretation was proved a year later, in a startling, almost romantic way, by the discovery by Mr. Dawson and a young French naturalist who were resifting and searching the gravel at the exact spot where the jaw was found, of one of the great canine teeth, twice as big as that of any man and resembling that of a chimpanzee (see Fig. 26 and its explanation). There was a good deal of hesitation about the admission of the correctness of Dr. Smith Woodward's presentation of the jaw of Eoanthropus, with so close a resemblance to that of a chimpanzee.