The Wealth of Nations by Part 5 Chapter 1 Page 76

different causes, chiefly from the continually increasing expenses of defending the nation against the invasion of other nations, the private estate of the sovereign had become altogether insufficient for defraying the expense of the sovereignty, and when it had become necessary that the people should, for their own security, contribute towards this expense by taxes of different kinds, it seems to have been very commonly stipulated that no present for the administration of justice should, under any pretence, be accepted either by the sovereign, or by his bailiffs and substitutes, the judges.

Those presents, it seems to have been supposed, could more easily be abolished altogether than effectually regulated and ascertained. Fixed salaries were appointed to the judges, which were supposed to compensate to them the loss of