The proposition that, if released, the coin will fall is not one which I know, or could know, a priori. It is conceivable that the coin will stay put or move in some other direction. If I have reason to believe what I do, the reason is empirical-a reason drawn from past experience. I believe that the coin will fall because I have discovered, from past observations, that this is how coins, and indeed, with a few explicable exceptions, all material objects, are disposed to behave. Experience has taught me that it is in the nature of unsupported bodies of this type to fall.