Cow-Bells

O what is there behind the hills,
That all of the bells must know?—
Over in all the light that fills
The Valley with that glow?

I followed a bell, and it all came true:
Some down, and a yellow-bird;
And Cedars—oh!—and specked with blue;
And everything else I heard:

Only whatever it is, behind
The bell with the farthest call;
The one I follow and never find,
—The loveliest one of all.