The county clerk of each county of this state, on demand, shall issue warrants to jurors and witnesses in payment for jury and witness fees, in all criminal cases in which the county is liable, on presentation of a certificate of attendance, issued by the clerk of the district court, or the clerk of the county court, showing the name of the witness or juror, the number of days in attendance, the distance traveled and the amount of such fees and mileage. The warrant so issued shall be signed by the county clerk and shall show on the face thereof the purpose for which the same was issued.