Page:The Formation of Vegetable Mould through the Action of Worms (1881).djvu/219

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Chap. IV.

OF ANCIENT BUILDINGS.

205

fires, separated by an interval of time, during which the 6 inches of "mortar and concrete

Mould, 16 inches thick.

Charred wood, 10 inches thick.

Mortar with broken tiles, 6 inches thick.

Charred wood, 2 inches thick.

Undisturbed gravel.

Fig. 10.

Section within a hall in the Basilica at Silchester. Scale 1/32.