are to follow, an increase in the weight of the points was almost
always accompanied by an increase in the apparent distance.


TABLE III.

Distances. 4 cm. 6 cm. 12 cm.

Weights
(Grams). 12 20 40 12 20 40 12 20 40

R. 3.9 3.2 3.0 6.2 5.6 5.3 11.4 10.4 9.3
F. 4.3 4.0 3.6 6.1 5.3 5.5 12.3 11.6 10.8
B. 4.1 3.6 3.1 6.0 5.7 5.8 12.0 10.2 9.4
P. 4.3 4.1 3.7 5.9 5.6 5.6 13.1 11.9 10.7

In the standard distances the points were each weighted to 6
grams. The first three figures signify that a two-point
distance of 4 cm., each point weighing 6 grams, was judged
equal to 3.9 cm. when each point weighed 12 grams. 3.2 cm.
when each point weighed 20 grams, etc. Each figure is the
average of five judgments.


Now the application of this principle in my criticism of Parrish's
experiments, and as anticipating the direction which the following
experiments will take, is this: if we take a block such as Parrish
used, with only two points in it, and weight it with forty grams in
applying it to the skin, it is plain that each point will receive one
half of the whole pressure, or twenty grams. But if we put a pressure