SECTION 1. Every justice of the peace in the Philippine Islands is hereby invested with authority to make preliminary investigation of any crime aliened to have been committed within his municipality, jurisdiction to hear and determine which is by law now vested in the judges of Courts of First Instance. It shall be the duty of every justice of the peace, when written complaint under oath has been made to him that a crime has been committed within his municipality and there is reason to believe that any person has committed the same, which complaint, the justice believes to be well founded, or when he has knowledge of facts tending to show the commission of a crime within his municipality by any person, to issue an order for the arrest of the accused and have him brought before the justice of the peace for such preliminary examination.
The order of arrest shall be directed and delivered to any officer authorized by law to make arrests, signed by the justice of the peace, shall contain the name of the accused, if known, and the offense with which lie is charged. The form of the written complaint may be substantially as follows:
"The United States against A. B. "______________________, justice of the peace for the municipality of ____________________________ Province of ________________________, the __________________ day of ______________________,190______ .
"A. B. is accused by the undersigned of the crime of (giving its legal appellation, such as murder, arson, robbery, or the like) committed as follows:
"That the said A. B. on the ____________________ day of ______________________, 190 ______, at the ______________________ of ___________________, Province of ___________________ (here set forth the acts or commissions charged as an offense), contrary to statute in such cases made and provided.
"(Signed)_____________________________"
The form of the order of arrest may he substantially as follows:
"To any lawful officer, greeting:
"You are hereby commanded to arrest (giving the name of the accused), who stands charged before me with the crime; of (stating the nature of the offense charged) and to bring him before me as soon as possible, to be dealt with as law directs. This ___________________ day of ___________________, 190_____ .
"(Signed by the name of the justice of the peace.)"
Neither the complaint nor order of arrest, however, shall be void because of any mere informality or failure to follow the above forms. It shall be the duty of the officer to whom the order of arrest is delivered to arrest the accused forthwith and bring him before the justice of the peace as directed in the order.