The Wind-Mill has sails fixed to very long poles, and when the wind blows strong, round go the wings. As the wings blow round, they carry round a large stone inside the house; this stone rubs on top of another mill-stone, and corn is put between them, which is thus broken and ground into meal. We cannot eat corn till it is ground; but horses can. Some mill-stones are likewise carried round by a stream of running water, and some by the steam of boiling water. There are a number of water-mills on the Mill-dam which leads from Boston to Roxbury.

There is a wind-mill in Boston, which stands in Sea-street, near the new bridge to South-Boston.

There is a steam-mill next to the iron-works at South-Boston, which grinds corn and grain.