Bhargava, J.

1. The respondent was a registered dearer carrying on the business of selling goods liable to sales-tax under the Central Provinces and Berar Sales Tax Act, 1947 (hereinafter referred to as "the repealed Act"). For the period from 3rd November, 1956 to 23rd October l957, the respondent filed his return which was not accepted by the Sales-tax officer, who, on March 10, 1959, issued a notice in Form XII to the respondent. Subsequent to this notice, on May 23, 1959, the turnover of the sales of the respondent was assessed to tax under S. 11 (4) (a) of the repealed Act. In the meantime, on April 1, 1959, the Madhya Pradesh General Sales Tax Act, 1958 (Act No. II of 1959) (hereinafter referred to as "the new Act") came into force. On October 23, 1962, the Sales-tax Officer discovered that part of the turnover of the respondent for the period mentioned above had escaped assessment and issued a notice under S. 19 (1) of the new Act. The respondent raised a preliminary objection that his sales had been assessed under the repealed Act, under which the limitation of a period of three years was prescribed by Section 1-A for assessment of escaped turnover. The Sales-tax Officer rejected that objection by his order dated 29the October, 1962, and decided to proceed with the reassessment. There upon, the respondent moved a petition under Articles 226 and 227 of the "Constitution before the High Court of Madhya Pradesh, Jabalpur, praying for the quashing of the order of the Sales-tax Officer dated 29 the October, 1962, and the notice dated 23rd October, 1962. The High Court held that the period of limitation governing the proceedings instituted by the notice dated 23rd October, 1962, was that laid down under S. 11-A (1) of the repealed Act, so that the proceedings were barred by time. The notice dated 23rd October, 1962, and the subsequent order dated 29th October, 1962 were consequently quashed. The Sales-tax Officer of Jabalpur has now come up to this Court in this appeal by special leave against this order of the High Court.

2. Section 19 (1) of the new Act, on which reliance was placed by the Sales-tax Officer reads as follows:-

"19. (1) Where an assessment has been made under this Act and the Commissioner, in consequence of any information which has come into his possession, is satisfied that any sale or purchase of goods chargeable to tax under this Act, during any year, has been under-assessed or has escaped assessment or assessed at a lower rate or any deduction has been wrongly made therefrom, the Commissioner may, at any time within five calendar years from the expiry of such year, after giving the dealer a reasonable opportunity of being heard and after making such enquiry as he considers necessary, proceed, in such manner as may be prescribed, to reassess the tax payable on any such sale or purchase and the Commissioner may direct that the clearer shall pay, by way of penalty in addition to the amount of tax so assessed, a sum not exceeding that amount:

Provided that in the case of an assessment made under any Act repealed by Section 52, the period of re-assessment on the ground of under-assessment, escapement or wrong deduction shall be as provided in such Act notwithstanding the repeal thereof."

The contention on behalf of the Sales-tax Officer was that for the sake of assessing the escaped turnover, the provision applicable was that contained in the main clause of S. 19 (1), and that the proviso was not applicable in this case. On the other hand, the respondents contention was that, in his case, the assessment had been made under the repealed Act, so that the proviso was applicable and the period of limitation for issue of a valid notice was that laid down in S. 11-A (1) of the repealed Act which is as follows:-

"11- A. (1) If in consequence of any information which has come into his possession, the Commissioner is satisfied that any turn over of a dealer during any period has been under-assessed or has escaped assessment or assessed at a lower rate or any deduction has been wrongly made therefrom, the Commissioner may at any time within three calendar years from the expiry of such period after giving the dealer a reasonable opportunity of being heard and after making such enquiry as he considers necessary, proceed in such manner as may be prescribed, to re-assess or assess, as the case may be, the tax payable on any such turnover and the Commissioner may direct that he clearer shall pay, by way of penalty in addition to the amount of tax so assessed, sum not exceeding that amount."

The High Court has accepted the plea put forward on behalf of the respondent.

3. The facts given by us above clearly show that the original assessment of the respondent was in respect of a period when the new Act had not come into force. The respondent had filed the return, and even the notice in that connection was issued by the Sales-tax Officer prior to the enforcement of the new Act. The actual order of assessment was made on 23rd May, 1959 shortly after the new Act had come into force. The mere enforcement of that Act by the time the order of assessment was passed by the Sales-tax Officer cannot lead to the conclusion that the assessment of the respondent was made under the new Act and not under the repealed Act. It was under S. 52 of the new Act that the repealed Act was repealed, and that Section itself under the proviso laid down that such repeal shall not affect the previous operation of the said Act or any right, title, obligation or liability already acquired, accrued or incurred thereunder. There was also the further addition that subject thereto, anything done or any action taken (including any appointment, notification, notice, order rule, form. Regulation certificate or licence in the exercise of any power conferred by or under the said Act shall, in so far as it is Act inconsistent with the provisions of this Act, be deemed to have been done or taken in exercise of the powers conferred by or under this Act, as if this Act were in force on the date on which such thing was done or action was taken. In view of this proviso it has to be held that when this new Act came into force on 1st April. 1959, all rights title, obligation or liability already acquired, accrued or incurred under the repealed Act by the respondent remained affected and intact. The rights and liabilities, which had been acquired or incurred under the repealed Act, included the right or liability to be assessed in accordance with the provisions of the repealed Act in respect of turnover of sales effected during the time when that Act was in force. The repealed Act laid down what turnover was taxable, how it was to be computed, and at what rate the tax was to be charged. These provisions clearly created rights as well as liabilities of dealers. Those rights and liabilities were thus preserved by S. 52 of the new Act. The assessment which was completed in the case of the respondent on 23rd May, 1959 was therefore, an assessment in accordance with the rights and liabilities of the respondent under the repealed Act: and this being so, it has to be held that the proviso to S. 19 (l) of the new Act was applicable to the case of the respondent. As a result of this proviso, the period of re-assessment on the ground of under-assessment, escapement or wrong deduction in the case of the respondent had to be as provided in S. 11-A (1) of the repealed Act, so that the period was three years and not five years as laid down by S. 19 (1) of the new Act. The notice dated 23rd October, 1962, was clearly issued beyond the period of limitation prescribed by S. 11-A (1) of the repealed Act and the proceedings in pursuance of it were time-barred.

4. In the alternative, this question may be examined in another aspect. Section 11-A (1) of the repealed Act itself created a right in favour of the respondent not to be assessed in respect of turnover that was under assessed or had escaped assessment after the expiry of the period prescribed in that subsection. The proviso to S. 52 of the new Act preserved this right of the respondent, and on this ground also, the Sales-tax Officer was not competent to issue the notice for reassessment after that period of limitation had expired.

5. In this connection, learned counsel for the Sales-tax Officer drew our attention to two subsequent pieces of legislation that amended the new Act. The first one of these is the Madhya Pradesh General. Sales Tax (Second Amendment) Act, 1963 (Act 23 of 1963) (hereinafter referred to as "the Amending Act").By Section 3 of this Amending Act, Section 19 (1) of the new Act was amended, so as to introduce some words in the principal clause of S. 19 (1) The words introduced were: "or any Act repealed by Section 52", and they were to be inserted at both the places where the word "this Act" occurred in the principal clause. It was urged that, as a result of this amendment this principal clause became applicable even to cases in which assessment had been made under the repealed Act, and taking into account the effect of this subsequent amendment, we should hold that the Sales-tax Officer was not incompetent to make the assessment when he purported issue the notice on 23rd October 1962, as the notice was issued within the period of five years laid down in the principal clause of S. 19 (1) of the new Act. It is, however significant that, though the principal clause of S. 19 (1) was amended, the proviso to was not deleted by the Amending Act. The proviso therefore, continued to remain in force. It is well-recognised that a proviso is added to a principal clause primarily with the object of taking out of the scope of that principal clause what is included in it and what the Legislature desires should be excluded. Consequently, even if it be held that the effect of the Amending Act was that, under the principal clause of S. 19 (1), the reassessment of the under-assessed or escaped turnover in the case of the respondent could be taken up within a period of five calendar years, that provision became ineffective because of the continued existence of the proviso. The Amending Act had not come into force when the High Court decided the petition, and consequently, the High Court had no occasion to consider its effect. However, as we have indicated above, the order made by the High Court remains unaffected even after this amendment, and the decision given that the limitation applicable to the case of the respondent is that laid down by S. 11-A (1) of the repealed Act is correct. It is true that the amendment in S. 19 (1) of the new Act made by the Amending Act was given retrospective effect under S. 5 of the Amending Act, but that also is immaterial, because, even after the amendment, the provision contained in the proviso had to prevail over the principal clause of S. 19 (1).

6. The brought to our second piece of legislation notice was the Madhya Pradesh General Sales Tax (Second Amendment) Act, 1964 (Act 20 of 1964) by which also S. 19 (1) of the new Act was slightly amended. That amendment, however, has no hearing on the point which we are called upon to decide in this appeal, and consequently, needs no consideration.

7. The appeal fails and is dismissed with costs.

8. Appeal dismissed.