horizon, and (_c_) the mean variation of the series of judgments.


TABLE I.

Observer. Constant Error. Average Deviation. Mean Variation.
_A_ (100) -19.74 38.78 10.67
_C_ (90) -18.18 23.89 10.82
_D_ (100) -19.84 33.98 7.95
_E_ (50) - 4.28 72.84 6.90
_F_ (100) +46.29 46.29 2.05
_G_ (50) +14.96 35.40 8.40
_H_ (50) -27.22 27.46 5.78
_I_ (50) + 6.62 53.34 7.45
_K_ (50) + 1.08 30.26 6.59
_L_ (20) -56.70 56.70 10.39

Average: -7.70 41.89 7.69


The average subjective horizon shows a negative displacement, the
exceptional minority being large. No special facts could be connected
with this characteristic, either in method of judgment or in the past
habits of the reactor. The average constant error is less than an
eighth of a degree, and in neither direction does the extreme reach
the magnitude of a single degree of arc. Since the mean variation is
likewise relatively small, there is indicated in one's ordinary
judgments of this kind a highly refined sense of bodily orientation in
space.