ABSTRACT
THE question which is at the focus of this discussion is why a large brain should be better than a small one for directing the sort of behaviour we call intelligent. It is true enough that ants and bees seem to lead a complex and successful social life with brains the size of pins' heads, but for the mammalian kind of behaviour a larger brain is needed and unless it is about as large as an apple we do not expect much evidence of our kind of reasoning and generalization.
