See Gravel. It may be observed here, that of whatever material a walk is composed, that it is essentia] to have it well under-drained, and for this purpose an understratum of flints or brick-bats, twelve inches deep, is not too much. Walks so founded, are never wet or soft. Coal ashes, or which is still better, fresh tan, makes a pleasant winter walk, particularly on tenacious soils, as it never adheres to the shoes, either during rain or after frost; half an inch I think is sufficient. It likewise makes a soft and pleasant summer walk, and from its loose nature, is readily cleared from weeds. If not wanted during summer, it may readily be swept clean off after a few dry days. It is invaluable for covering walks or footpaths in the kitchen garden, when there is much wheeling of manure or soil, to be done during frost, which is too often obliged to be suspended after ten or eleven o'clock, when there is clear sunshine, from the ground getting soft and clammy. With a covering of tan, the operation may be continued throughout the day, and even during wet weather.

If the tan remain permanently, it will require renewing every two years.- Gard. Chron.