Firm loss set-off allowed where apportioned partner remains in firm, enabling set-off and carry forward under statutory provisions. Where the taxpayer is a firm, losses apportioned to a partner but not set off by that partner before the relevant cut-off assessment year may be allowed to be set off against the income of the firm provided the apportioned partner continues in the firm; such allowed losses may thereafter be carried forward and set off under the general set-off and carry forward provisions applicable to firms.