Letting in the Jungle

Veil them, cover them, wall them round-
 Blossom, and creeper, and weed-
 Let us forget the sight and the sound,
 The smell and the touch of the breed!
 Fat black ash by the altar-stone,
 Here is the white-foot rain
 And the does bring forth in the fields unsown,
 And none shall affright them again;
 And the blind walls crumble, unknown, o'erthrown,
 And none shall inhabit again!