The Wealth of Nations by Part 3 Chapter 2 Page 22

in some parts of Scotland. They are called steel-bow tenants. Those ancient English tenants, who are said by Chief Baron Gilbert and Doctor Blackstone to have been rather bailiffs of the landlord than farmers properly so called, were probably of the same kind.

To this species of tenancy succeeded, though by very slow degrees, farmers properly so called, who cultivated the land with their own stock, paying a rent certain to the landlord. When such farmers have a lease for a term of years, they may sometimes find it for their interest to lay out part of their capital in the further improvement of the farm; because they may sometimes expect to recover it, with a large profit, before the expiration of the lease. The possession even of such farmers, however, was long extremely precarious, and still is so in many parts of Europe.