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ACCOMPANVING PHENOMENA OF DENTAL DECAY 157
frequently, in the portions adjacent to the boundary of the cari-
ous portion. With reflected light these portions have a horny
appearance, similar to that found in senile roots, and with trans-
mitted light they present hyaline bands and spots. The focus
Fig. 60.
c.
Portion of a Loxgitudixal Grocsd Skction through the Crow.v ok a Mdi.ar,
Showing two cavities of decay, with the transparent zones at c. (After Gj-si.)
(Herd) of the caries is surrounded by a diaphanous halo. The
opaque, carious dentinal cone, therefore, is invested by a trans-
lucent zone, extending from the periphery toward the center;
around a more spherical, carious portion of the dentine a cres-
centic diaphanous halo is sometimes met with (Fig. 60). The
