If any witness, being duly summoned, fails to attend, the judge of probate shall enter up a conditional fine against him, not exceeding $50.00, and shall thereupon issue a notice to such witness to appear at a term of said court, not more than 30 days from the date of such notice and show cause why such fine should not be made absolute. The proceedings thereafter shall be governed by the same rules, and such witness shall be subject to the same liabilities, except as to the amount of the fine, as are provided by law in cases of defaulting witnesses in the circuit court.