Section 20. The legislative assembly is hereby authorized and empowered to provide by 
law  for  the  erection,  purchasing  or  leasing  and  operation  of  one  or  more  terminal  grain 
elevators in the state of North Dakota, to be maintained and operated in such manner as the 
legislative assembly shall prescribe, and provide for inspection, weighing and grading of all 
grain received in such elevator or elevators.