Every injured employee or his representative shall immediately on the occurrence of an accident, or as soon thereafter as practicable, give or cause to be given to the employer a written notice of the accident, and the employee shall not be entitled to physician’s fees nor to any compensation which may have accrued under the terms of this Article prior to the giving of such notice, unless it can be shown that the employer, his agent or representative, had knowledge of the accident, or that the party required to give such notice had been prevented from doing so by reason of physical or mental incapacity, or the fraud or deceit of some third person; but no compensation shall be payable unless such written notice is given within 30 days after the occurrence of the accident or death, unless reasonable excuse is made to the satisfaction of the Industrial Commission for not giving such notice and the Commission is satisfied that the employer has not been prejudiced thereby. (1929, c. 120, s. 22.)