272):-- "All our perceptions are dependent on our organs and the disposition of our nerves and animal spirits." And again, though in relation to another question, he observes:-- "There are three different kinds of impressions conveyed by the senses.

The first are those of the figure, bulk, motion, and solidity of bodies.

The second those of colours, tastes, smells, sounds, heat, and cold.

The third are the pains and pleasures that arise from the application of objects to our bodies, as by the cutting of our flesh with steel, and such like.

Both philosophers and the vulgar suppose the first of these to have a distinct continued existence.