And be it enacted, That every such Magistrate shall be empowered summarily to convict any Person charged with any Offence against this Act, on the Oath of One or more Witnesses or by his own Confession, and to award the Penalty or Punishment herein provided for such Offence; and the Matter of such Complaint shall be heard and determined by One of the Justices appointed to be a Magistrate of the Police Courts of the Metropolis at one of the said Police Courts ; or if the Offence shall have been committed or the Offender apprehended in any Part of the Metropolitan Police District for which no Police Court shall be established as aforesaid, the Matter of such Complaint may be also heard and determined by any Two or more Justices acting in and for the County in which the Offence was committed or the Offender apprehended.