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