It sifts from Leaden Sieves -
It powders all the Wood
It fills with Alabaster Wool
The Wrinkles of the Road -
It makes an Even Face
Of Mountain, and of Plain -
Unbroken Forehead from the East
Unto the East again -
It reaches to the Fence -
It wraps it Rail by Rail
Till it is lost in Fleeces -
It deals Celestial Veil
To Stump, and Stack - and Stem -
A Summer's empty Room -
“Fleeces” is another trope for snow, which, as you may have noticed, is fleecy white .
It sifts from Leaden Sieves - 311