The notches (or grooves, channels, etc) are ceremonial or good "medicine"....and NOT for keeping the arrow straight......here is my reasoning:
- If you want straighter arrows....you pick straighter shoots (or split straighter wood).
- Many NA arrows do not have grooves....even among plains tribes.
- I've seen crooked NA arrows with (and without) grooves.
- The grooves actually weaken the arrow....making it less able to flex or bend without breaking.
- Most people forget (or don't know) that the old methods of making arrows used a lot of "medicine"....not only carving grooves but smudging, using feathers from certain birds, special colors of paint, etc.
- Many grooves are filled with paint....another reason to suspect "medicine" value.
- Laubin confirmed (from his conversations with NA elders) that the grooves had special "powers".
- The very fact that the grooves are "mysterious" to most people supports the ceremonial idea.
- Arrows that have been made
specifically for ceremonies always have inscriptions, special markings, etc....and I've never heard the idea that, "The lack of decoration is powerful medicine."
- There is a bow in one of Jim Hamm's books that has a "mysterious" groove running down the entire belly of the bow. The most likely explaination is that it has some ceremonial (not structural) value. (Does it help the bow keep its shape?) This is yet a nother reason to think that grooves are good medicine.
- And last, but not least, they look "cool".