232 A HISTORY OF ART IN CIIALIXEA AND ASSYRIA. disappear about the middle of the total length. At the point shown in our Fig. 94 the arch has lost its supports and rests directly upon the pavement of the channel. Its ellipse is com- posed of eight voussoirs, four on each side, and a key with a small wedge-shaped stone voussoir on each side of it. Between IMG. 93. Sewer at Khor^abad, with semicircular vault ; compile.! from Place. the two points shown in our Figs. 93 and 94 the upper and lower sewers have become one, the vaulted roof of the first and the paved floor of the second bein^ continued in a single tunnel. At e> the point where this tunnel comes to a sudden end it is closed by a wall, through which two small openings are pierced to serve as outlets for the sewer within (Fig. 94).
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