section hereof. ( c ) Third-class mail matter, which includes all matter not declared nonmailable by law or regulation, the same not being included in the first or second class. Nothing in this section contained shall be so construed as to admit to the second-class rate regular publications, designed primarily for advertising purposes, or for free circulation, or for circulation at nominal rates. DAESTI Publishers of matter of the second class may, without subjecting it to extra postage, fold within any regular issue a supplement; but in all cases the added matter must be germane to the publication which it supplements, that is to say, matter supplied in  order to complete that to which it is added or supplements, but omitted from the regular issue for want of space, time or greater convenience, and such supplement must in every case be issued with the publication, and bear the title and date of the publica tion which it supplements and its pages be numbered consecutively. EIDaAH SECTION  1174 . Writing in or on Second-Class Matter . — Mailable matter of the second class shall contain no writing, print, or sign thereon or therein in addition to the original print, except as herein provided, to wit: The name and Copyright 2012 CD Technologies Asia, Inc. and Accesslaw, Inc. Philippine Law Encyclopedia 2011 350 SECTION  1173 . Conditions for Admission of Publications to Second Class . — The conditions upon which a publication shall be admitted to the second class are as follows: HEITAD ( a ) It must be issued at stated intervals, as frequently as four times a year, and bear a date of issue, and be numbered consecutively. EcTCAD ( b ) It must be issued from a known office of publication. ( c ) It must be formed of printed paper sheets, without board, cloth, leather, or other substantial binding, such as distinguish printed books for preservation from periodical publications. ( d ) It must be originated and published for the dissemination of information of a public character, or devoted to literature, the sciences, arts, or some special industry, and have a legitimate list of subscribers. HEcIDa ( e ) It must be sent by the publisher thereof, and from the office of publication, or from a news agency to actual subscribers thereto, or to other news agents. ICTaEH