What was the purpose of momadays journey?

Mammedaty is the narrator's grandfather. Mammedaty is a tall, lean figure of a man who has a mystical quality about him. Mammedaty is a peyote man which means that he possesses the ability to see things that others do not. Mammedaty sees four strange things in his life. The most interesting of which involves Mammedaty's wish to know where the fine dirt around a mole hole comes from. Mammedaty was a hard worker who held true to Kiowa tradition. Unfortunately, most of the narrator's knowledge of his grandfather comes from memories as Mammedaty died long ago.