with both eyes are compared with those made under conditions of
monocular vision. The latter experiments were carried on in alternate
series with those already described. The figures are given in the
following tables:


TABLE VI.

JUDGMENTS MADE IN DIFFUSED LIGHT.

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