Psychic Investigators examines British anthropology’s engagement with the modern spiritualist movement during the late Victorian era. Efram Sera-Shriar argues that debates over the existence of ghosts and psychical powers were at the center of anthropological discussions on human beliefs. He focuses on the importance of establishing credible witnesses of spirit and psychic phenomena in the writings of anthropologists such as Alfred Russel Wallace, Edward Burnett Tylor, Andrew Lang, and Edward Clodd. The book draws on major themes, such as the historical relationship between science and religion, the history of scientific observation, and the emergence of the subfield of anthropology of religion in the second half of the nineteenth century. For secularists such as Tylor and Clodd, spiritualism posed a major obstacle in establishing the legitimacy of the theory of animism: a core theoretical principle of anthropology founded in the belief of “primitive cultures” that spirits animated the world, and that this belief represented the foundation of all religious paradigms. What becomes clear through this nuanced examination of Victorian anthropology is that arguments involving spirits or psychic forces usually revolved around issues of evidence, or lack of it, rather than faith or beliefs or disbeliefs.

In 1972 Stephen Jay Gould took the scientific world by storm with his paper on punctuated equilibrium, written with Niles Eldredge. Challenging a core assumption of Darwin's theory of evolution, it launched the career of one of the most influential evolutionary biologists of our time--perhaps the best known since Darwin.

Now, thirty-five years later, and five years after his untimely death, Punctuated Equilibrium (originally published as the central chapter of Gould's masterwork, The Structure of Evolutionary Theory) offers his only book-length testament on an idea he fiercely promoted, repeatedly refined, and tirelessly defended. Punctuated equilibrium holds that the great majority of species originate in geological moments (punctuations) and persist in stasis. The idea was hotly debated because it forced biologists to rethink entrenched ideas about evolutionary patterns and processes. But as Gould shows here in his typically exhaustive coverage, the idea has become the foundation of a new view of hierarchical selection and macroevolution.

What emerges strikingly from this book is that punctuated equilibrium represents a much broader paradigm about the nature of change--a worldview that may be judged as a distinctive and important movement within recent intellectual history. Indeed we may now be living within a punctuation, and our awareness of what this means may be the enduring legacy of one of America's best-loved scientists.