Section 6
SEC. 6. Section forty-two of Act Numbered Twenty-three hundred and thirty-nine is hereby amended to read as follows: "SEC. 42. Percentage tax on printers and publishers.— Printers and publishers shall pay a tax equivalent to one per cent of their gross receipts; but persons engaged in the publication or printing and publication of any newspaper, magazine, review, or bulletin appearing at regular intervals and having fixed prices for subscription and sale shall not be taxed on receipts from sales of, subscription to, or advertisements in such publication; but this exemption shall not apply to any publication the principal purpose of which is the publication of advertisements."