Section 2(1) of the Act defines agricultural income and states (so far as it is relevant for the purposes of this appeal): (1) "agricultural income" means (a) any rent or revenue derived from land which is used for agricultural purposes, and is either assessed to land revenue in the taxable territories or subject to a local rate assessed and collected by officers of the Government as such : (b) any income derived from such land by: (i) agriculture, or (ii) the performance by a cultivator or receiver of rent in kind of any process ordinarily employed by a cultivator or receiver of rent in kind to render the produce raised or received by him fit to be taken to market, or (iii) the sale by a cultivator or receiver of rentin kind of the produce raised or received by him, in respect of which no process has been performed other than a process of the nature described in sub clause (ii) . . . . . . . . . . .