Virgil and Durrell in Arcady: Umbra, Penumbra, and Dark Pastoral Bruce Redwine 1. Cartography surgamus: solet esse gravis cantantibus umbra, iuniperi gravis umbra; nocent et frugibus umbrae. Let us rise. The shade is oft perilous to the singer—perilous the juniper’s shade, hurtful the shade even to the crops.i —Virgil, Eclogue 10.75-76 Tread softly, for here…