Section 1. Subsection (I) of section two thousand and twenty-nine of Act Numbered Twenty-seven hundred and eleven is hereby amended to read as follows:
" (I) In a loan to the Insular Government of not exceeding five hundred thousand pesos, for the purchase or construction of public buildings for the offices of the Insular Government, including the equipment and maintenance of the same: Provided, That said loan shall be repaid in ten annual installments with interest at four per centum per annum: And provided, further, That whenever said loan shall be made, one-tenth the amount so loaned, together with interest on the deferred payment at the rate of four per centum per annum, shall be regarded without further legislative action as appropriated annually from the unappropriated surplus in the Insular Treasury until the loan and interest thereon shall have been paid and such amount so appropriated shall be paid to the Postal Savings Bank on account of said loan."