. Descriptive anatomy of the human teeth . Fig. 82. Fig. 78* (Par. 105).—Left Lower First Molar, Lingual Surface, a, Mesio-buccal cusp; b, disto-buccal cusp; c, distal cusp; d, mesio-Iingual cusp; e, disto-lingual cusp; /, /, gingival line; g, mesial root; h, distal root; the roots arespread wide apart; i, lingual groove. Fig. 79* (Par. 105).—Left Lower First Molar, Lingual Surface. This toothhas prominent cusps, and the roots are straight and close together. References thesame as for Fig. 78. Fig. 80* (Par. 106).—Left Lower First Molar, Mesial Surface, c, Mesio-buccal cusp; d, mesio-lingual c

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. Descriptive anatomy of the human teeth . Fig. 82. Fig. 78* (Par. 105).—Left Lower First Molar, Lingual Surface, a, Mesio-buccal cusp; b, disto-buccal cusp; c, distal cusp; d, mesio-Iingual cusp; e, disto-lingual cusp; /, /, gingival line; g, mesial root; h, distal root; the roots arespread wide apart; i, lingual groove. Fig. 79* (Par. 105).—Left Lower First Molar, Lingual Surface. This toothhas prominent cusps, and the roots are straight and close together. References thesame as for Fig. 78. Fig. 80* (Par. 106).—Left Lower First Molar, Mesial Surface, c, Mesio-buccal cusp; d, mesio-lingual cusp; e, mesial surface, point of concavity; /, f,gingival line; g, mesial root with broad groove. Fig. 81* (PsiY. 107).—Left Lower First Molar, Distal Surface. The cuspsare very prominent, a, Mesio-buccal cusp; b, disto-buccal cusp; c, distal cusp; d,mesio-lingual cusp; e, disto-lingual cusp; /, gingival line; g, mesial root; h, distalroot. Fig. 82* (Par. 108).—Lower First Molar, with three roots. *IIlustration, ij^ diameters. T

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