The Wealth of Nations by Part 5 Chapter 2 Page 41

In the Venetian territory all the arable lands which are given in lease to farmers are taxed at a tenth of the rent. The leases are recorded in a public register which is kept by the officers of revenue in each province or district.

When the proprietor cultivates his own lands, they are valued according to an equitable estimation, and he is allowed a deduction of one-fifth of the tax, so that for such lands he pays only eight instead of ten per cent of the supposed rent.

A land-tax of this kind is certainly more equal than the land-tax of England. It might not, perhaps, be altogether so certain, and the assessment of the tax might frequently occasion a good deal more trouble to the landlord. It might, too, be a good deal more expensive in the levying.