By KenNETH W. Millican, B.A., Cantab., M.R. C.S., London: H. K. Lewis, 1883, pp. 107. This essay is a bold application of the Darwinian hypothesis to explain certain anomalous forms and combinations of disease and disputed points relating to the specificity of disease. The general idea is not altogether a novel one, but Mr. Millican develops it more fully than has yet been done, and attempts to...