In these circumstances, by the Indian Income tax (Amendment) Act, 1939, this section was recast as under: "34 (1) If in consequence of definite information which has come into his possession the Income tax Officer, discovers that income, profits and 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 case in which he has reason to believe that the assessee has concealed the particulars of his income or deliberately furnished inaccurate particulars 1, 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 principle 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, profits or gains, and the provisions of this Act shall, so far as may be, apply accordingly as if the notice were a notice issued under that sub section: Provided * * * " It may be pertinent to note that by virtue of this amendment the concept of the Income tax officer deriving definite information was introduced for the first time.