“ Commencing at a point on the south line of section 20, in township 75 N., range 44 W. of the fifth principal meridian, produced 861 1/2 feet west of the S. E. corner of said section, and running thence northwesterly to a point on the south line of lot 4 of section 10, in township 15 N., of range 13 E. of the sixth principal meridian, 2,275 feet east of the S. W. corner of the N. W. 1/4 of the S. E. 1/4 of said section 10; thence northerly, to a point on the north line of lot 4 aforesaid, 2,068 feet east of the center line of said section 10 ”