Section 18. Rules of department

Subject and in conformity to this chapter
  and the constitution and laws of the state, the commissioner may  enact,
  amend and repeal necessary rules which shall
    1. Regulate and control the transaction of business by the department,
  provide for the exercise of the powers and the performance of the duties
  of the department and prescribe the powers and duties of the bureaus and
  of the directors of bureaus and other officers and employees thereof;
    2. Provide for carrying into effect the provisions of this chapter and
  of the laws of the state in respect of food and food traffic;
    3.  Regulate  the  conduct  of  investigations, inquiries and hearings
  authorized by this chapter and prescribe necessary forms and notices;
    4. Establish official grades for foods and farm products and prescribe
  the use of such  grades,  and  provide  for  the  marking,  packing  and
  shipping of foods and farm products so graded.
    5. Establish uniform tolerances or amounts of reasonable variation for
  containers  of food and provide uniform regulations for carrying out the
  provisions of this chapter in relation to such containers.
    6. Provide generally for the exercise of the powers and performance of
  the duties of the department as prescribed in this chapter and the  laws
  of  the  state  and  for  the  enforcement  of  their provisions and the
  provisions of the rules enacted as herein provided.
    The rules of the department in force at the time  this  chapter  takes
  effect  shall  continue as the rules of the department, until amended or
  repealed by the commissioner.