Aug 27 - 99 Sunday, Camp XVIII. He made my last camp and got away by 8 A.M. Had lunch on the Laramie Plains and arrived at Laramie by 3 P.M. In coming down the Laramie Hills it seems clear to me that Prof Knight's theory that the marble collects justly in the metamorphosed Carboniferous? dolomite. The structure seems like about as follows: [illegible] Share specimens of the marble with perfection and tell of the dolomite which I suppose furnishes the marble. Spent a party there after me at Knight's house and then to the hotel for a clean cloth and wash. Spent the night at Knight's house.