Gutters, in building, denote canals in the roofs of houses, for receiving and carrying off rain wa-ter. They are also formed in streets, for similar purposes.

Gutters in agriculture, may be so disposed as to communicate with a large pond, or reservoir, for containing a fresh supply of water for cattle.

In the 4th vol. of the "Trans-actions of the Society for the En-couragement of Arts," etc. Mr. Harriot recommends the formation of gutters made of elm, 18 inches wide, 12 inches deep, and 50 feet in length, with proper lids at each end, to let the water in or out at pleasure. This drain ought to lie 31/2 feet lower than the surface of the earth; for, in Mr. Har-riot's opinion, nothing can be more absurd than the general mode of arranging square gutters; because there is no comparison in the discharge of water from a fiat gutter, of the same number of cubic inches, with that of a square one.