. Descriptive anatomy of the human teeth . Fig- 59 Fig. 60. Fig. Fig. 59* (Par. 8i).—Right Upper First Molar, Distal Surface, a, Mesio-buccal cusp; b, disto-buccal cusp; d, disto-lingual cusp; f, f, gingival line; k,mesial root; /, distal root; m, lingual root; 0, concavity of the distal surface. Fig. 60* (Par. 82).—Left Upper First Molar, Buccal Surface. A bell-crowned tooth. Fig. 61* (Par. 85).—Upper First Molar showing the mesial and distal rootsunited at their apexes. Fig. 62* (Par. 86).—The Right Upper Molars showing the progressive dimi-nution of the disto-lingttal cusp from the fir
. Descriptive anatomy of the human teeth . Fig- 59 Fig. 60. Fig. Fig. 59* (Par. 8i).—Right Upper First Molar, Distal Surface, a, Mesio-buccal cusp; b, disto-buccal cusp; d, disto-lingual cusp; f, f, gingival line; k,mesial root; /, distal root; m, lingual root; 0, concavity of the distal surface. Fig. 60* (Par. 82).—Left Upper First Molar, Buccal Surface. A bell-crowned tooth. Fig. 61* (Par. 85).—Upper First Molar showing the mesial and distal rootsunited at their apexes. Fig. 62* (Par. 86).—The Right Upper Molars showing the progressive dimi-nution of the disto-lingttal cusp from the first to the third molar. Illustration, i5<^ diameters. UPPER FIRST MOLAR. 69 gival enamel ridge. The occlusal margin is surmounted bythe mesio- and disto-lingual cusps (c, d), of which the mesialis usually the larger. In the five-cusped molar the fifth cusp{e) is seen on the mesio-lingual lobe. The mesial and distalmargins are convex, converging rapidly toward the lingualroot. In the few examples in which the lingual groove is notapparent, the lingual surf
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