SECTION 1. Paragraph (n) of section one of Act Numbered Eighteen hundred and one is hereby amended to read as follows:
"(a) All barrios belonging to a municipality that shall guarantee a daily attendance in their schools of not less than forty pupils, duly certified to by the division superintendent of schools and by the supervising teacher of the schools of the municipality, shall have the right of option to participate in the funds appropriated by this Act for the purpose indicated: Provided, however, That the sum shall not exceed in each case four thousand pesos."