How does Walter M. Miller, Jr. use imagery in A Canticle for Leibowitz?

Examples of Imagery:

"'You,' Arkos rubbed his chin and seemed lost in unhappy speculation. 'I can see it too clearly. The Leibowitz cause is shelved. Poor Brother is struck down by a falling brick. There he lies, moaning for absolution. In the very midst of us, mind you. And there we stand, looking down in pity - clergy among us - watching him croak his last, without even a last blessing on the lad. Hell-bound. Unblessed. Unshrived. Under our very noses. A pity, eh?"' Chapter 8, pg. 81.

"The buzzards laid their eggs in season and lovingly fed their young: a dead snake, and bits of a feral dog. "The younger generation waxed strong, soared high and far on black wings, waiting for the fruitful Earth to yeid up her bountiful carrion. Sometimes dinner was only a toad. Once, it was a messenger from New Rome." Chapter 11, pg. 110.