The Turks and Saracens developed arrows for shooting containers full of cumbustible material like greek fire. I think this was a kind of tethered arrow with a cup or similar on the end from which the egg like continer was launched. I think I also remember people writing about fire arrows.
The Turkish bow was used to launch many diferent projectiles ranging from incendary devices, to very short darts to arrows that would cut the bow strings of anyone trying to shoot them back.
Mark in England
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Arrows with little bottles instead of arrowheads are also shown in one of Matthew Paris' illustrations. They were also sometimes filled with Quicklime to cause more problems for the enemy.