Rainbow which a glass prism could separate into the full spectrum of colours, rejecting the theory that the colours were produced by a modification of white light. He also showed that red light is refracted less than blue light, which led to the first scientific explanation of the major features of the rainbow. Newton's corpuscular theory of light was unable to explain supernumerary rainbows, and a satisfactory explanation was not found until Thomas Young realised that light behaves as a wave under certain conditions, and can interfere with itself. Young's work was refined in the 1820s by George Biddell Airy, who
The Colours of Animals "The Colours of Animals" and outside it. And he is recognised as the first scientist to identify frequency-dependent selection, as described in this book. By 1919, the book was being described in "Nature" as a classic work. Poulton is paid homage by J.A. Allen and B.C. Clarke for his pioneering work on frequency-dependent selection "by predators acting on non-mimetic polymorphic prey (i.e. for apostatic selection), anticipating many of the points made by later workers. We draw attention to his remarkable insight." The "Oxford Dictionary of National Biography" comments that Poulton's book "concisely and simply explained the many forms of coloration