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154 DENTAL HISTOLOGY AND OPERATIVE DENTISTRY.
Fig. 138.
Fig. 139.
Young and old membranes (from sheep): 1>, dentin: Cm, cementum: (';ยป', thickening of eenien-
tiim to attach fibers at the corner; Pd, peridental membrane ; B, boue forming the wall of the
alveolus ; P, pulp. (About 80 X.)
