x x x (2) Where any assessee sustains a loss of profit or gains in any year, being a previous year not earlier than the previous year for the assessment for the year ending on the 31st day of March, 1940, under the head "Profits and gains of business, profession or vocation", and the lose cannot be wholly set off under sub section (1) the portion not so set off shall be carried forward to the following year and set off against the profits and gains, if any, of the assessee from the same business, profession or vocation for that year; and if it cannot be wholly so set off, the amount of loss not so set off shall be carried forward to the follow ing year, and so on; but no loss shall be so carried forward for more than six years: Provided that (a) Where the loss sustained is a loss of profits and gains of a business, profession or vocation to which the first proviso to sub section (1) is applicable and the profits and gains of that business, profession or vocation are, under the provisions of clause (c) of sub section (2) of section 14, exempt from tax, such loss shall not be set off except against profits and gains accruing or arising in an Indian State from the same business, profession or vocation and exempt from tax under the said provisions; (b) Where depreciation allowance is, under clause (b) of proviso to clause (vi) of sub section of section 10, also to be carried forward, effect shall be given to the provisions of this sub section; x x x It may perhaps be stated here that Mr. Kolah has placed no reliance on the provisions of the Taxation Laws (Part B States) (Removal of 320 Difficulties) Order, 1950.