Preamble
"SEC. 1978 A. Messages which shall not be transmitted.—No message belonging to any of the following classes shall be transmitted by telegraph, cable or wireless telegraphy or delivered to its addressee by any officer or employee of the Bureau of Posts; "(a) Written or printed message or communication describing or pertaining to or conveying or purporting to convey, any information concerning any lottery or gift enterprise. "(b) Written or printed message or communication containing scurrilous libels against the Government of the United States or the Government of the Philippine Islands or containing any statement which tends to disturb or obstruct any lawful officer in the administration of his office or in the performance of his duty, or which tends to instigate others to cabal or meet together for unlawful purposes, or which suggests or incites rebellious conspiracies or tends to disturb the peace of the community or to stir up the people against the lawful authorities. "(c) Written or printed message or communication containing obscene, lewd, lascivious, filthy, indecent words or language. "(d) Written or printed message or communication advertising or describing or giving, directly or indirectly, information where, how, from whom, or by what means any article, instrument, drug or substance designed, intended, or adopted for preventing conception or producing abortion may be obtained or made, or where or by whom any act or operation of any kind for the procuring or producing of abortion, will be done or performed, or who or by what means conception may be prevented or abortion produced."