There is nothing remarkable in that.

But we also learn from these egg-patches that the hand had been separated from the arm before it was thrown into the pond; and there is something very remarkable in that." I leaned over his shoulder and gazed at my sketches, amazed at the rapidity with which he had reconstructed the limb from my rough drawings of the individual bones.
"I don't quite see how you arrived at it, though," I said.
"Well, look at your drawings.

The egg-patches are on the dorsal surface of the scapula, the humerus, and the bones of the fore-arm.

But here you have shown six of the bones of the hand: two metacarpals, the os magnum, and three phalanges; and they all have egg-patches on the _palmar_ surface.

Therefore the hand was lying palm upwards." "But the hand may have been pronated." "If you mean pronated in relation to the arm, that is impossible, for the position of the egg-patches shows clearly that the bones of the arm were lying in the position of supination.