The State board of health may refuse certificates to individuals guilty of malpractice or dishonorable conduct, and may revoke certificates for like causes; such revocation being after due notice and trial by the said board, with right of appeal to the circuit court of the county in which such individual resides; but no such refusal or revocation shall be made by reason of his belonging to or practising in any particular school or system of medicine (_ib._, s. 10). The examination fee is not retained if a certificate is refused, but the applicant may again, at any time within a year after refusal, be examined without an additional fee, and if a certificate be again refused he may, as often as he sees fit, on payment of the fee, be examined until he obtains a certificate (_ib._, s. 11). Examinations may be wholly or partly in writing, and shall be of an elementary and practical character, embracing the general subjects of anatomy, physiology, chemistry, materia medica, pathology, pathological anatomy, surgery, and obstetrics, but sufficiently strict to test the qualifications of the candidate as a practitioner of medicine, surgery, and obstetrics. The chapter does not apply to females practising midwifery (_ib._, s. 12). DEFINITION, EXCEPTIONS.—Any person is regarded as practising medicine who professes publicly to be a physician, and to prescribe for the sick, or who appends to his name “M.D.” This act also applies to apothecaries and pharmacists who prescribe for the sick. It does not apply to commissioned officers of the United States army and navy and marine hospital service (_ib._, s. 13).