The houses are mostly one-storeyed, built of unburned bricks, and have flat roofs.

This consists of a huge tower of unburned brick resting on a small hill of debris, the whole rising to a height of loo ft.

high, covering a space of about 8 acres, near the northwestern edge of which, towards the western corner, he built a ziggurat, or stage-tower, of three stages of unburned brick, faced with kiln-burned bricks laid in bitumen.

Brimstone is easily burned without any extraneous help; indeed the only precaution required is to take care lest the heat produced by the burning sulphur should not volatilize part of it in the unburned state.

The use of biodiesel results in a substantial reduction of unburned hydrocarbons.