I was reading through either Larry Belitz's book on the Sioux Buffalo Hide Tipi or Adolph Hungrywolf's book on Tipis and came across a James Mooney article about Cheyenne bison hide tanning. Apparently the stretched out bison hide (hair down and staked parallel to ground) was brained and soaked and scrubbed with pounded yucca roots. When thoroughly cleaned and fleshed the hair side was dry scraped. Then the entire hide was soaked in brain solution and then worked. Seems like a step could be saved by simply washing and braining the hide in rawhide (not hair on flint) form. Maybe the yucca soap and brain solution on the flesh side opens up the fibers more so that the second braining from the epidermis side will penetrate better. Anybody read anything similar to this or tried this method? The paper Mooney wrote told how many women, hours, hides, etc. there were and somewhat detailed on how much labor it took. Will post the exact source of article when I find it again.