In a message dated 31/10/2006 18:23:15 GMT Standard Time, NABOKV-L@HOLYCROSS.EDU writes:

I've finally tracked down the Edsel Ford poem from
which Kinbote quotes. I found it on page 76 of Ford's collection /A Thicket
of Sky/ (Homestead House, 1961).

The Image of Desire

We never knew when next the fox might strike,
But many a dark night lying in the loft
Straining our ears to catch the swift, the soft,
The cunning coming of him or his like,
We held a fortress as men hold a wake:
Silent and grim, bound to a solemn task
Which wasn't interrupted even to ask
The time; our boyhood honor was at stake.
And often when the cock crew, shaking fire
Out of the morning and the misty mow,
We stayed on, staring, hard put to leave off--
Lest in the wood the image of desire
Spring up behind us yapping, although now
We know we've kept this vigil long enough.

What a wonderful discovery by Matthew! Immediately (to me) it becomes clear that Shade was shadowing Edsel Ford, not Frost. And thereby Wordsworth [ie The Prelude] at a further remove; but covering up his indebtedness. This is not dissimilar to the charlatan Ezra's concealment of his moonlight theft from poor, melancholy Lolita Iddings in 1911.