res (thing), 67, 201, 201fn, 209, 214, 216, 225; res cogitans   (thinking thing), 98, 112-113, 207, 211, 319-320, 320 n. 19; res corporea (corporeal thing), 90-91, 94, 101; res extensa (extended thing), 66, 89-92, 97-98, 112 (BT)