" This provision has, in substance, there are certain verbal differences which are not material for our purposes been re enacted as section 32(2) of the 1961 Act, which now reads thus: B "32(2) Where, in the assessment of the assessee (or, if the assessee is a registered firm or an unregistered firm assessed as a registered firm, in the assessment of its partners) full effect cannot be given to any allowance under clause (ii) of sub section ( 1) in any previous year, owing to there being no profits or gains chargeable for that previous year, or owing to the profits or gains chargeable being less than the allowance, then, subject to the provisions of sub section (2) of section 72 and sub section (3) of section 73, the allowance or part of the allowance to which effect has not been given, as the case may be, shall be added to the amount of the allowance for depreciation for the following previous .year and deemed to be part of that allowance, or if there is no such allowance for that previous year, be deemed to be the allowance for that previous year, and so on for the succeeding previous years.