FORMATION OF YINE-BORDEES. 



263 



Description of Flan. 



a Back wall. h Back path. 



c Flow-pipes, consisting of 2 lines of trough-pipes 3 inches in diameter. 

 d Return pipe, 3 inches plain. e Front ventilators. 



f Border inside the house communicating with outside border g by arches 



in front wall. 

 h Dung-trench. The wall on the border side of this trench is arched 



below and pigeon-holed above. 

 i Valencia slate-slabs, 1 inch thick, fitting into a rabetted curbing-stone. 

 j Dung chamber beneath vine-border, with arched roof: these arches are 



built with pigeon-holes as shown at p, through which the ammoniacal 



gas arising from the fermenting material enters the drainage and the 



soil and is absorbed by the roots. 

 Ti Six inch common drain-pipes, with openings inside the house at I, 



through which the ammonia from the chamber j passes into the house 



and is absorbed by the young leaves. The openings I are provided 



