What does tom find when he looks for his wife

From the text:

At length, it is said, just in the brown hour of twilight, when the owls began to hoot and the bats to flit about, his attention was attracted by the clamor of carrion crows hovering about a cypress-tree. He looked up and beheld a bundle tied in a check apron and hanging in the branches of the tree, with a great vulture perched hard by, as if keeping watch upon it. He leaped with joy, for he recognized his wife's apron, and supposed it to contain the household valuables.

As he scrambled up the tree, the vulture spread its wide wings and sailed off, screaming, into the deep shadows of the forest. Tom seized the checked apron, but, woful sight! found nothing but a heart and liver tied up in it!