Reviser's note: The term "director of the department of agriculture" has been substituted for "public service commission" in this chapter since the powers and duties of the commission devolved upon the director of agriculture by virtue of 1921 c 7 § 90, 1921 c 137 §§ 1, 2, 1921 c 145 § 8, and 1937 c 90 § 10.