The Constitution of Man is the classical exposition of phrenology, written by George Combe and published in 1828. The Constitution bridged the early anatomical science of the nineteenth century with evolutionary concepts. Its central argument is that the laws of the physical universe are as active in the human brain - and therefore in the mind (because of its role as a process of the brain) - as in the external, "physical" universe. Human behaviour is, therefore, usefully comprehended in neurological - rather than religious or philosophical - terms.