In 1870, Sir William Crookes (1832–1919) travelled to Gibraltar to observe the solar eclipse. He kept a diary and produced beautiful accounts of the expedition - alongside altogether more specific observations, including the 656 steps down a local cliff face, and every item in his luggage. It is with the same meticulous approach and cheerful prose that he records, in letters, journal articles and reports, the successes and failures of the vast range of projects in which he was involved. Although initially trained as a chemist, Crookes worked across the spectrum of the sciences, from consulting on preventative measures against cattle plague through to investigating spiritualism. Opening with a foreword by the physicist Sir Oliver Lodge, this biography by Edmund Edward Fournier d'Albe (1868–1933), first published in 1923, explores a remarkable life of enquiry through a host of first-hand sources.