  The growing critical attitude of Unitarianism coincides historically with the rise of evolutionary theory: especially Darwinism, but also wider theory such as the work of Auguste Comte and Herbert Spencer. Jevons was particularly favourable towards Spencer’s evolutionary ethics. The evolutionary perspective allows Jevons to integrate his religious beliefs in a view on the world as growing towards higher moral consciousness and rationality.  Like Spencer, Jevons argues that there is no conflict at all between science and religion. On the contrary: they are both directed towards truth, and therefore they cannot contradict each other.  Jevons congratulated John Herschel for his condemnation of the Theological Declaration of Scientific Man, which equated freedom of inquiry with a tendency to irreligion (Black 1977a: 60). Jevons even intended to write the Tenth Bridgewater Treatise (following Charles Babbage’s Ninth Bridgewater Treatise) to show the perfect compatibility between science and religion, but he never completed this work.