Brick made from earth are very extensively used for house building, chaff and short straw being used as a binding material, the brick being simply dried in the sun, as seen in Fig. 89. A house in the process of building, where the brick were being used, is seen in Fig. 90. The foundation of the dwelling, it will be observed, was laid with well-formed hard-burned brick, these being necessary to prevent capillary moisture from the ground being drawn up and soften the earth brick, making the wall unsafe.
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Fig. 90.—Foundation of dwelling, consisting of hard-burned brick; balance of wall to be sun-dried earth brick, seen in Fig. 89.
Several kilns for burning brick, built of clay and earth,
were passed in our journey up the Pei ho, and stacked
about them, covering an area of more than eight hundred
feet back from the river, were bundles of the kaoliang stems
to serve as fuel in the kilns.
The extensive use of the unburned brick is necessitated by the difficulty of obtaining fuel, and various methods are adopted to reduce the number of burned brick required in construction. One of these devices is shown in Fig. 79, where the city wall surrounding Kashing is constructed of alternate courses of four layers of burned brick separated by layers of simple earth concrete.
