If this is the excerpt:
The land’s sharp features seemed to be
The Century’s corpse outleant,
His crypt the cloudy canopy,
The wind his death-lament.
The ancient pulse of germ and birth
Was shrunken hard and dry…
Then the imagery Thomas Harding is using from "The Darkling Thrush" is DEATH IMAGERY.
The use of the words CORPSE, CRYPT, DEATH-LAMENT, SHRUNKEN represents death.