There are different ways of measuring facial prognathism, and with sufficient care all may be effective; I prefer, for practical reasons, linear measurements from the basion, which, together with the facial and subnasal heights, give triangles that can readily be reconstructed on paper and allow a direct measurement of both the facial and the alveolar angle. The three needed diameters from basion are taken, the first to the "prealveolar point," or the _most anterior_ point on the upper dental arch above the incisors; the second to the "subnasal point," or the point on the left (for convenience) of the nasal aperture, where the outer part of its border passes into that which belongs to the subnasal portion of the maxilla (the point where the subnasal slant begins); and the third to nasion. The facial height is that from the alveolar point (_lowest_ point of the upper alveolar border in the median line) to nasion; while for the subnasal height, which can not be measured directly, I utilize the difference between the facial and nasal heights, which is very close to the needed dimension. The important basion-nasion diameter has already been considered. That to the subnasal point needs no comment. That to the prealveolar point shows in the western and other Eskimo as follows: ESKIMO CRANIA: BASION-PREALVEOLAR POINT DIAMETER ALL ESKIMO Males: Mean diameter centimeters 10.54 Mean relation to length of skull per cent _56.3_ Females: Diameter centimeters 9.99 Relation per cent _55.8_ MALES A = Basion prealveolar point diameter B = Its relation to length of skull +------------------+------------------+------------------+ | Southwestern and | Northwestern | Northern Arctics | | midwestern | | and northeastern | +------------------+------------------+------------------+ | _A_ _B_ | _A_ _B_ | _A_ _B_ | | 10.38 _56.4_ | 10.58 _56.4_ | 10.65 _56.2_ | | Mean skull lengths | | 18.41 | 18.75 | 18.96 | +------------------+------------------+------------------+ | FEMALES | +------------------+------------------+------------------+ | 9.85 _55.7_ | 10.06 _56.3_ | 10.06 _55.4_ | | Mean skull lengths | | 17.69 | 17.86 | 18.15 | +------------------+------------------+------------------+