It was said that the profits of the year of succession were liable to assessment in the usual course in the financial year 1941 42 and the Income tax Officer had no power to make an accelerated assessment in order to give relief to the persons succeeded in the business 495 and that being so, it was not right to hold that the expression " previous year" in section 25, sub section (4), was co related to the assessment year 1939 40, i.e the year in which,the succession took place or to the assessment year 1941 42 in which in the ordinary course assessment for those profits would have been made but that on a true construction of this sub section and having regard to the history of its enactment and the object for which it was inserted in section 25, the assessee firm was entitled to exemption from the payment of tax, only for the period between 1st July, 1939, and 29th February, 1940, and to no more.