This frame is put over the forearm in such a way that the paper in the window comes over the markings made on the arm.

The markings show through very clearly, and the points are copied on the paper.

Then certain boundary marks at the corners are made, both on the paper and on the arm, at exactly the same places, the frame is removed, and all the markings on the arm are erased except the boundary points.

The result is that at any time the frames can be put over the arm again by matching the boundary points, and then the original temperature spots on the skin will be shown by the markings on the paper window.
Proceeding to repeat the exploration of the same area in this way, Mr.
C makes records of many groupings of points for both hot and cold sensations on the same area; he then puts the frames one upon another, holds them up before a window so that they have a bright background, and is thus able to see at a glance how nearly the results of the different sittings correspond.
His results, put very briefly, fail to confirm the theory that the sense of temperature has an apparatus of fixed spots for heat and other fixed spots for cold.

For when he puts the different markings for heat together he finds that the spots are not the same, but that those of one frame fall between those of another, and if several are put together the points fill up a greater or smaller area.