The gardener utters the phrase "the soul of the plants," and cultivates them very well without knowing what he means by this term. The violin-maker poses, draws forward or back the "soul of a violin" beneath the bridge in the belly of the instrument; a puny piece of wood more or less gives the violin or takes away from it a harmonious soul. We have many industries in which the workmen give the qualification of "soul" to their machines. Never does one hear them dispute about this word. Such is not the case with philosophers. For us the word "soul" signifies generally that which animates. Our ancestors the Celts gave to their soul the name of _seel_, from which the English _soul_, and the German _seel_; and probably the ancient Teutons and the ancient Britons had no quarrels in their universities over this expression. The Greeks distinguished three sorts of souls--+psyche+, which signified the sensitive soul, the soul of the senses; and that is why Love, child of Aphrodite, had so much passion for Psyche, and why Psyche loved him so tenderly: +pneuma+, the breath which gives life and movement to the whole machine, and which we have translated by _spiritus_, spirit; vague word to which have been given a thousand different meanings: and finally +nous+, the intelligence. We possessed therefore three souls, without having the least notion of any of them. St. Thomas Aquinas (Summation of St. Thomas. Lyons edition, 1738) admits these three souls as a peripatetic, and distinguishes each of these three souls in three parts. +psyche+ was in the breast, +pneuma+ was distributed throughout the body, and +nous+ was in the head. There has been no other philosophy in our schools up to our day, and woe betide any man who took one of these souls for the other. In this chaos of ideas there was, nevertheless, a foundation. Men had noticed that in their passions of love, hate, anger, fear, their internal organs were stimulated to movement. The liver and the heart were the seat of the passions. If one thought deeply, one felt a strife in the organs of the head; therefore the intellectual soul was in the head. Without respiration no vegetation, no life; therefore the vegetative soul was in the breast which receives the breath of air. When men saw in dreams their dead relatives or friends, they had to seek what had appeared to them. It was not the body which had been consumed on a funeral pyre, or swallowed up in the sea and eaten by the fishes. It was, however, something, so they maintained; for they had seen it; the dead man had spoken; the dreamer had questioned him. Was it +psyche+, was it +pneuma+, was it +nous+, with whom one had conversed in the dream? One imagined a phantom, an airy figure: it was +skia+, it was +daimon+, a ghost from the shades, a little soul of air and fire, very unrestricted, which wandered I know not where.