The statutory basis of the newspaper post has remained unchanged since 1870, and the provisions of the Act of 1870 were included in the Post Office Act of 1908, which contains the present authority for the privilege. There has been some necessary interpretation by the Post Office of the definition of a newspaper as given in the Act. The chief points on which difficulty has arisen are (1) as to the amount of news-matter required in a publication, and (2) as to the character of the matter which can be accepted as news-matter. The Act provides that the publication should consist "wholly or in great part of political or other news or of articles relating thereto, or to other current topics." This requirement is considered to be satisfied if as much as one-third of the publication consists of matter accepted as news. The proportion, when fixed, was based on an examination of the proportion of news-matter contained in the average newspaper, and represents the actual proportion then generally met with. There is no provision regarding the proportion to be maintained between the size of a newspaper within the meaning of the Act and its supplement, but, under the accepted interpretation of the statute, a newspaper may contain a supplement of equal size, and that supplement may consist wholly of advertisements. The result of this is that publications containing a proportion of only one-sixth of news-matter may pass at the newspaper rate of postage. As to the second requirement, a strict interpretation of the regulation is not insisted on, and, in general, articles, pictures, or drawings relating to any matters of current or topical interest are accepted. This lack of precision in the provisions of the Act, and the consequent difficulty of framing or enforcing regulations restricting the privilege within even reasonable limits, have been largely taken advantage of, especially in recent years, by the publishers of trade and fashion papers, with the result that publications weighing in some cases as much as 3 pounds are sent through the post at the usual newspaper rate of a halfpenny. Nor are the enormous weight of these papers, and the large proportion of advertisement matter, the only objections. The news-matter on which they rely as entitling them to the newspaper privilege is often of the most doubtful character, consisting largely of accounts of shop sales or of commercial exhibitions, with lengthy descriptions of the articles displayed.