What were the different conditions in Holway and Boring's experiments and what were the results?

Goal of observer: match size of comparison circle to test circle. Condition 1 - observers could determine the depth of the test patch using binocular disparity, motion parallax and shadows. Condition 2 - observers viewed the test circle with one eye to remove binocular disparity cues. Condition 3 - observers viewed the test circle through a peephole to remove motion parallax cues. Condition 4 - in addition to viewing the circle through a peephole, drapes were used to remove the shadows.