Thomas Henry Huxley (1825-95) became known as 'Darwin's bulldog' because of his forceful and energetic support for Darwin's theory, most famously at the legendary British Association meeting in Oxford in 1860. In fact, Huxley had some reservations about aspects of the theory, especially the element of gradual, continuous progress, but in public he was unwavering in his allegiance, saying in a letter to Darwin 'As for your doctrines I am prepared to go to the Stake if requisite'. In his 1892 Essays upon Some Controverted Questions, Huxley collected some of his previously published writings, of which the titles alone give some flavour of his pugnacious stance in debate: 'The interpreters of Genesis and the interpreters of Nature'; 'Science and pseudo-science'; 'Agnosticism and Christianity'. The passion for scientific truth which underlies everything he writes is well demonstrated in this lively and still-relevant collection.