The Wealth of Nations by Part 5 Chapter 1 Page 87

the management of that fund, or with the payment of those salaries. That fund might arise from the rent of landed estates, the management of each estate being entrusted to the particular court which was to be maintained by it.

That fund might arise even from the interest of a sum of money, the lending out of which might, in the same manner, be entrusted to the court which was to be maintained by it. A part, though indeed but a small part, of the salary of the judges of the Court of Session in Scotland arises from the interest of a sum of money. The necessary instability of such a fund seems, however, to render it an improper one for the maintenance of an institution which ought to last for ever.

The separation of the judicial from the executive power seems originally to have arisen from