It was concluded that we have two temperature senses, one for hot and the other for cold.
Taking the problem at this point, Mr.C.[3] wished to define more closely the relation of the two sorts of sensation to each other, and thought he could do so by a method by which he might repeat the stimulation of a series of exact spots, very minute points on the skin, over and over again, thus securing a number of records of the results for both hot and cold over a given area.

He chose an area of skin on the forearm, shaved it carefully, and proceeded to explore it with the smallest points of metals which could be drawn along the skin without pricking or tearing.

These points were attached to metallic cylinders, and around the cylinders rubber bands were placed; the cylinders were then thrust in hot or cold water kept at certain regular temperatures, and lifted by the rubber bands.

They were placed point down, with equal pressure, upon the points of the skin in the area chosen.

In this way, points which responded only to hot, and also those responding only to cold, were found, marked with delicate ink marks in each case, until the whole area was explored and marked in different colours.