ABSTRACT
The sensations aroused in the touch organ are of two sorts: for we perceive a certain pressure or traction heat or cold; but in both cases the sensation seems to depend on some sort of pressure. If two contiguous and mobile parts are touched simultaneously, these parts are more clearly discriminated and seem farther apart than if one part is touched in two places simultaneously. If two parts of the skin are touched simultaneously we can discriminate them more easily if they are located opposite each other or if they differ in structure or use. The weight of objects is perceived in two ways: first by the touch-sense residing in the skin, and then by the sense belonging to the voluntary muscles, through which we recognise the degree of effort of the muscles in overcoming the weights and other obstacles.
