These pipes are of glazed earthenware, taper at one end, and each fitting into the large end of the next.

The cement is a mixture of lime, fat, and hair, which gets hard and firm when cold, but can be loosened by a very slight application of heat.

A thousand years has made no alteration in the way of making these pipes.

Here, however, the ground is so level that one great characteristic of Moorish waterworks is not to be seen.

I mean the water-columns which are such a feature in the country round Palermo, and in other places where the system of irrigation introduced by the Moorish invaders is still kept up.