Abstract

Describes erosion in falls of earth upon the roofs of London. The material must have fallen from a considerable distance, and whether forming mere pellets or splashes a few feet in diameter it developed a surprisingly uniform summit level of little more than one inch in height. An impermeable roofing foundation with a shape favoring run-off contributed greatly to erosion by rain water and the loam content washed out quickly leaving a gravel residue.

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