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" In determining, therefore, the nature of the Act, regard must be had to the substance rather than to the form. If a new Act is 'to explain' an earlier Act, it would be without object unless construed retrospective. An explanatory Act is generally passed to supply an obvious omission or to clear up doubts as to the meaning of the previous Act. It is well settled that if a statute is curative or merely declaratory of the previous law retrospective operation is generally intended. The language shall be deemed always to have meant' or 'shall be deemed never to have included" is declaratory, and is in plain terms retrospective. In the absence of clear words indicating that the amending Act is declaratory, it would not be s.o construed when the amended provision was clear and unambiguous. An amending Act may be purely clarificatory to clear a meaning of a provision of the principal Act which was already implicit. A clarificatory amendment of this nature will have retrospective effect and, therefore, if the principal Act was existing law when the constitution came into force, the amending Act also will be part of the existing law."

"The presumption against retrospective operation is not applicable to declaratory statutes.... In determining, therefore, the nature of the Act, regard must be had to the substance rather than to the form. If a new Act is "to explain" an earlier Act, it would be without object unless construed retrospectively. An explanatory Act is generally passed to supply an obvious omission or to clear up doubts as to the meaning of the previous Act. It is well settled that if a statute is curative or merely declaratory of the previous law retrospective operation is generally intended... An amending Act may be purely declaratory to dear a meaning of a provision of the principal Act which was already implicit. A clarificatory amendment of this nature will have retrospective effect (ibid., pp. 468-69)".