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102 DENTAL HISTOLOGY AND OPERATIVE DENTISTRY.

and arc (Icseribed as the striation of the ciiaiiicl.
It is seen not only in
isolated rods (Fig. 79), hut also in sections ground in their direction (Fig.
Fig. 82.

Eiiii tid l.y '-(•raping. (About 83). This appearance of striation in the enamel is caused by the alter-
nate expansions and constrictions of the rods refracting the light like a
Fig. S8.

Enamel showing striation. (About 1000 X.)

lens. In sections the expansions in adjoining rods are opjwsite to each
other, the difference in the refracting power of the ]n'isniatic and inter-
prismatic substances producing the same effect.