Patent... [CAP.400 21 18. (I) If it appears to the Registrar in the case of any application for a patent­ (0) that it is frivolous on the ground that it claims as an invention anything obviously contrary I to well-established natural laws; or (b) that the use of the invention in respect of which the appli­ cation is made would be contrary to law or morality; or (c) that it claims as an invention a substance capable of being used as food or medicine which is a mixture of known ingredients possessing only the aggregate of the known properties of the ingredients, or that it claims as an invention a process producing such a substance by mere admixture; Refusal of application in certain cases he may refuse the application. (2) If it appears to the Registrar that any invention in respect of which an application for a patent is made might be used in any manner contrary to law, he may refuse the application unless the specification is amended by the insertion of such disclaimer in respect of that use of the invention. or such other reference to the illegality thereof. as the Registrar thinks fit. (3)' An appeal shall lie from any decision of the Registrar under this section. . 19. (I) If, in the case of a complete specification lodged in pur­ Powers of Registrar if suance of an application for a patent, which application was accom­ specification panied by a provisional specification, the result of any examination or application or investigation made in terms of section sixteen is adverse to the defective applicant in regard to any matter referred to in that section, or it is found that the invention described in the complete specification is not substantially the same as that described in the provisional speci­ fication or that the complete specification includes an invention not included in the provisional specification, the Registrar may, subject to the provisions of subsection (6) of section fourteen­ (0) refuse to accept the complete specification until it has been amended to his satisfaction; (b) with the consent of the applicant, cancel the provisional specification and direct that the application be post-dated to the date upon which the complete specification was lodged at the Patent Office; or (c) where the complete specification includes an invention not included in the provisional specification, allow the applica­ tion to be proceeded with in so far as the invention included both in the provisional and in the complete specification is concerned and allow an application for the additional invention included in the complete specification to be made and authorise the application for such additional invention,