I saw the other thread regarding bone arrows and would like to address some of the concerns people expressed there.
Eskimos occasionally used bone arrows, but not when give a choice.
The bone arrows I've heard about were caribou bone and not always round.
The femurs would just be split and fletched and sometimes fitted with an arrowhead.
Someone said that you would need a 28 inch bone for this. I think if you compared your arms to those of an Eskimo like myself, you would see why that isn't the case. Like many Asian cultures, the eskimo are a small, and rather stocky people who often replace draw length with draw weight. I am rather tall for an Eskimo, being mostly Irish and only part eskimo, at 5'10", yet my draw is only 24 inches at best.
If anyone has any additional info on bone arrows or knows where to acquire some caribou bones please let me know because I would like to experiment with bone arrows.