 As a check on the internal management of his charge, and especially to help him in the work of collecting the revenue, with each district governor was associated an accountant.Further that each of these officers might be the greater check on the other, Ahmad Shah I enforced the rule that when the governor was chosen from among the royal slaves the accountant should be a free man, and that when the accountant was a slave the district governor should be chosen from some other class.This practise was maintained till the end of the reign of Muzaffar Sháh II, when, according to the "Mirăt-i-Áhmedi", the army became much increased, and the ministers, condensing the details of revenue, farmed it on contract, so that many parts formerly yielding one rupee now produced ten, and many others seven eight or nine, and in no place was there a less increase than from ten to twenty per cent.