“ Whenever the Secretary of the Treasury finds that such fund is in excess of an amount adequate to meet future interest and principal payments on all such bonds, he may, with the approval of the Philippine Government, purchase with such excess any other bonds of the Philippines, its Provinces, cities, municipalities, and instrumentalities. ”

“ The term 'United States duty,' when used in connection with the computation of export taxes, means the lowest rate of ordinary customs duty in effect at the time of the shipment of the article concerned from the Philippines and applicable to like articles imported into the continental United States from any foreign country, except Cuba, or when more than one rate of ordinary customs duty is applicable to such like articles, the aggregate of such rates. ”

“ The term 'Philippine article' means an article the growth, produce or manufacture of the Philippines, in the production of which no materials of other than Philippine or United States origin valued in excess of 20 per centum of the total value of such article was used and which is brought into the United States from the Philippines. ”