After the Amending Act of 1939 and before the Amending Act of 1948 Section 34 stood as follows: "(1) If in consequence of definite information which has come into his possession the Income tax Officer, discovers that income, profits or gains chargeable to income tax have escaped assessment in any year, or have been under assessed, or have been assessed at too low a rate, or have been the subject of excessive relief under this Act the Income tax Officer may in any ease in which he has reason to believe that the assessee has concealed the particulars of his income or deliberately furnished inaccurate particulars thereof at any time within eight years, and in any other case at any time within four years of the end of that year, serve on the person liable to pay tax on such income profits or gains or in the case of a company on the principal officer thereof a notice containing all or any of the requirements which may be included in a notice under sub section (2) of section 22, and may proceed to assess or re assess such income, profit or gains, and the provisions of this Act, shall.