Walter Frank Raphael Weldon (1860–1906) was a British evolutionary biologist and a founder of biometry, together with the highly influential journal Biometrika. Originally published in 1906, and written by fellow Biometrika founder Karl Pearson (1857–1936), this volume was created as a memorial for Weldon and his achievements. Although concise, the text is highly informative, containing numerous excerpts from Weldon's correspondence. A variety of illustrations are also incorporated, including material from Biometrika. This is a fascinating book that will be of value to anyone with an interest in Weldon's life and the development of biometrics.