Lecture VI

Brentano said: Whatever the soul consists of, as far as the substance in which it lives is concerned, it must be capable of individualization, for one can divide certain lower creatures, and each part will continue life with the same characteristics the creature had before being divided. You will know that this is possible with certain lower worms; they are unaffected if divided, and live on as two separate worms. From this Brentano concluded that an independent soul must be present in each separate piece. In other words, if a worm is divided in two and both parts continue to live, there must be a soul in each. He further concluded from this that the soul and the body must be one unity. He made a comparison which convinced him that his view was right. He compared the event of the worm with a triangle saying that the triangle divides into two triangles if a line is drawn through it. So he compared two concepts: that of dividing a worm in two and that of dividing a triangle in two, and let one explain the other. He considered the two concepts to be of equal simplicity and able to explain one another. But is it a valid comparison? For Brentano it was an important issue. But does it stand up to scrutiny? It does not. Let us say you have here a triangle; if you draw a line through it in a certain way, it does indeed divide into two triangles. Each half is a triangle just as the worm when divided becomes two worms. However, if you divide the, triangle differently, one of the parts becomes not a triangle but a quadrangle. In other words, only under certain circumstances do you get two triangles.