Section 72 provides: "( 1 ) Where for any assessment year, the net result of the computation under the head "Profits and gains of business or profession" is a loss to the assessee, . and such loss cannot be or is not wholly set off against income under any head of income in accordance with the provisions of section 71, so much of the loss as has not been so set off or, . or where he has no income under any other head, the whole loss shall, subject to the other provisions of this Chapter, be carried forward to the following assessment year, and (i) it shall be set off against the profits and gains, if any, of any business or profession carried on by him and assessable for that assessment year: Provided that the business or profession for which the loss was originally computed continued to be carried on by him in the previous year relevant for that assessment year; and (ii) if the loss cannot be wholly so set off, the amount of loss not so set off shall be carried forward to the following assessment year and so on.