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PERIDENTAL MEMBRANE. 149
trated by sections of temporary teeth that are ready to be shed (Fig.
132).
Fig. 132.
Root of a temporary incisor, showing absorption and rebuilding of cementum (from sheep) : 6r,gin-
givus ; D, dentin ; Cm, cementum ; Ab, absorption cavity, showing Howship's lacunse ; Cni^, new-
formed cementum. (About 50 X.)
EPITHELIAL STRUCTURES OF THE MEMBRANE.
The peridental membrane contains celhdar structures of epithelial
character which are so conspicuous that they demand consideration,
though their nature and origin are not as yet fully understood.
These structures were first well illustrated and described bv Dr.
