Susan Howe�s newest book of poetry is a revelation as well as a mystery. �What treasures of knowledge we cluster around.� That This is a collection in three pieces. �Disappearance Approach,� an essay about the sudden death of the author�s husband (�land of darkness or darkness itself you shadow mouth�), begins the book with paintings by Poussin, an autopsy, Sarah Edwards and her sister-in-law Hannah, phantoms, elusive remnants, and snakes. �Frolic Architecture,� the second section � inspired by visits to the vast 18th-century Jonathan Edwards archives at the Beinecke and accompanied by six black-and-white photograms by James Welling � presents hauntingly lovely, oblique text-collages that Howe (with scissors and �invisible� Scotch Tape and a Canon copier) has twisted, flattened, and snipped into �inscapes of force.� The final section, �That This,� delivers beautiful short squares of verse that might look at home in a hymnal, although their orderly appearance packs startling power: That this book is a history of a shadow that is a shadow of Me mystically one in another another another to subserve �The still-new century�s finest metaphysical poet.��The Village Voice Six black-and-white photographs