. l"he asscc;sce--a Hindu undivided fa1nily (-) \Vas ascsscd in 194445 for the income of its previous year ending Ocrober 30, 1943. The incon1c shown in the return \ras from iron foundry business and properly, and income from these sources only was taken into account in the original assessment. The asscsscc through a son of the karta was also a partner in the firm Raj Narain Durga Prasad. The accounting year of the firm ended on April I, 1944 and the assesscc's return did not show any income as share of profit in the firm nor was mention made in the return of Lhc cxislcnce of the partnership. In Dcccmhcr, 1943 1he asscssce aJong v.·ith Raj Narain Durga Prasad started a joint venture of supplying Sarpar and bamhoo to the Government. Bct\·ecn the commenccmeat of rhc joint venture and Februry 18, 1944, the asscsscc made investments in the Sarpar and hamboo business to the tune of Rs. 27,000 (as found by the Tribunal). The Income-tax Officer, when he discovered the asscssec's connection with the firm Rajnarain Durga Prasad gave a notice under s. 34 d[ the Indian Income-tax Acf, 1922 and nladc in I952 a revised ac;sessment for 1944-45, assessment year, in which he added the income of the assec:;see as found in the book.<i of the firm to the income already assessed. Later, he discovered the asc:;e'.See's invcsrmcntc; in the Sarpat an<l hamboo buc;ine5;o; and in 1954 he made another revi<ied assessment for the aSJiessment year 1944-45 treating the said investments as representing income from undisclosed ources. ·inc assec:;sec challenged both the asc;essments on the ground that s. 34( 1) (a) was not auracted. The a'-.c;es'\ee's pica was rejected hy the Appellale Asislant Commissioner and the Tribuna,l. The High Court in reference also held against the asses.see \.·ho by special leave appealed t0 this Court. The cootcnrions on behalf of rhc appdlant wcro: (i) As regards income from firm Rajnarain Durga Prasad it y,.·a<; suhmitti?d that th~ accounting year or that firm ended on April I, 1944 which v.·as y,.·ett after the close of the assessee's previot.l"ve:LT \Vhich ended on Octohcr 28. 1943. ci1hcr the income of the finn. ·nor the share of ac:;sesscc had hec:n determined till then, and it \vas not poc;,sible for 1he asse,sce to show the said incon1e in the return for 1944-45. foreover the full facts came to the kno\'ledge of the Tncome-tax Officer \vhen the assessment for the next a"6C..<;ment year \Vas made. ·rhcrefore s. 34( I) (a) y,.•as not attracted. (ii) As regards investn1en1s in the S:trpat and hamboo business the as5e'sec submitted that the husincss iLo;elf com menccd in Dccen1her, 1943 and having reuard to the definition o·f 'previou<; rear' in s. 2( 11) as it existed at the~ relcv:int time, the income from this ·source could not be shown a.. income of his previous year which ended on October 28 1941. The income from this source was duly disclosed to the lncomc.-iax Officer and was actuallv assessed in 1945-46. The;-eforc in the case of the 1954 revised J'Sessment also s. 34( I )(a) was not attracted. •