Observer. Constant Error. Average Deviation. Mean Variation. _A_ (50) - 28.46 29.04 8.87 _C_ " + 7.54 14.86 8.01 _D_ " + 39.32 43.28 13.83 _E_ " + 50.46 65.26 9.86 _F_ " + 62.30 62.30 1.60 _G_ " 0.00 45.28 9.66 _H_ " + 22.92 79.12 5.07 _I_ " + 14.36 51.96 8.02 _K_ " + 9.26 38.10 9.55 _L_ " - 61.10 61.10 6.36 Average: + 11.66 49.03 8.18 TABLE VII. JUDGMENTS IN ILLUMINATED POINT. Observer. Constant Error. Average Deviation. Mean Variation. _A_ (50) - 38.42 51.96 32.64 _C_ (30) - 29.03 41.23 35.75 _D_ (20) - 30.87 34.07 17.24 _E_ (50) + 65.30 75.86 29.98 _F_ " + 50.74 50.74 5.89 _G_ " + 66.38 88.10 44.98 _H_ " + 65.40 80.76 42.93 _I_ " - 0.02 80.22 47.53 _K_ " - 44.60 52.56 32.93 _L_ " - 71.06 73.30 31.86 Average: - 3.38 62.88 32.17