_WWS_ + 50 + 85 + 30 - 48

(3) _SSS_ + 20 - 6
_SSW_ - 61 - 81 - 15 - 7

_WWS_ + 50 + 30
_WWW_ - 25 - 75 + 5 - 25

(4) _SSS_ + 20 - 6
_WWW_ - 15 - 35 + 5 + 11


There seems at first sight to be no uniformity about these results.
Decreasing the first stimulation in the first case increases, in the
second case diminishes, the comparative length of the first interval.
We get a similar result in the decreasing of the second stimulation.
In the case of the third stimulation only does the decrease produce a
uniform result. If, however, we neglect the first pair of (3), we
observe that in the other cases the effect of a _difference_ between
the two stimulations is to lengthen the interval which they limit. The
fact that both subjects make the same exception is, however, striking
and suggestive of doubt. These results were obtained in the first
year's work, and to test their validity the experiment was repeated at
the beginning of the present year on three subjects, fifty series
being taken from each, with the results given in Table X.


TABLE X.

_ST_ = 3.0 secs. = _CT_.