The whole was bedded, not in mortar, but in clay, which has mostly been washed out of the joints; originally the surface was probably protected with a coating of stucco.
The walls, therefore, are now made thin, and are thoroughly cooled by water, which circulates through pipes or boxes bedded in them.
Fars series; marls, clays and sand stones with limestones and inter bedded strata of rock gypsum.
These become well rooted in about a twelvemonth, and then, after pruning, are bedded out in the nursery for two or three years.
The bedded haematites and limonites have been little exploited.