This system was soon followed by others who are less celebrated, having come after him. We may quote, among others, the interior angle of Walther, described by two lines, the one going from the occipital protuberance to the _crista galli_ process, the other from the frontal prominence to the root of the nose. There is also the external angle of Mulders, described by the facial line of Camper, and another line going from the base of the process to the root of the nose. And, lastly, that of Daubenton, described by a line going from the inferior margin of the orbit to the posterior region of the occipital orifice, and by another following the direction of the plane of the same.[330] All these systems are worth as much as Camper’s. All, including Camper’s, are false and worthless, from the mere fact that they pretend to measure a solid by the inclination of two of its boundary-planes one upon the other. After these methods of measurement, and superior to all of them, comes the _norma verticalis_ of Blumenbach; then the measurements of Cuvier, Owen, etc. Here we gain a step; we endeavour to measure a solid by its outline, or by the area of a systematic division or section. Already had Camper, better gifted than his angle would inform us, endeavoured to compare the different diameters of the profile of the skull, as seen in front.[331] As to Cuvier’s division, it is a very happy modification of a former proposed measurement, the incisive-occipital line of Doornick. It is obtained by lowering a vertical line to the plane of the external auditory orifice, and by leading another line from the incisors to the extreme protuberance of the occipital region. The relation of the two determinated divisions in this line by its intersection with the first, will give the statistics of comparison.[332]