Section 14. On any such testing, if it appears to the officer or other person so testing that the petroleum from

14. On any such testing, if it appears to the officer or other person so testing that the petroleum from which the sample has been taken is or is not dangerous petroleum, the officer or other person may certify the fact; and the certificate so given shall be receivable as evidence in any proceedings which may be taken 1886.] Petroleum. 145 (Penalties.—Sections 15-18.) taken under this Act against the dealer in whose possession the petroleum was found, and shall, until the contrary is proved, be evidence of the fact stated therein; and a certified copy of the certificate shall be given free of charge to the dealer at his request. Penalties.