Trans. Am. Phil. Soc, N. S. XVIII, S. 



PL. XXVIII 



ARCH OF BURNED BRICK LAID IN CLAY MORTAR, C, 4000 B. C— Nippur, 



71 em. high, SI em. span, 33 em. rise. 



At the orifice ot an open drain passing under the eastern corner of Dr-Gur's Ziggnrrat, c. 7 111. 

 same, and 4. 57 111. below a pavement which consists entirely of burned bricks of Sargou I and Na 

 inside the drain, Front of arch opened to let light pass through. 



the foundation of the 

 liu, View ta^en from 



