Another stellar Grote Club post by Simon Cook—this time on psychologist and anthropologist W. H. R. Rivers and his ‘conversion to diffusionism’, explained through the decisive influence of the writings of H. M. Chadwick and those of the archaeologist William Ridgeway. Simon rightly contends that in order to explain anthropology at Cambridge c. 1910s we have to cast aside our anachronistic notions of anthropology as a modern discipline in order to admit the contributions of Chadwick and Ridgeway, whom by modern definitions of anthropology are not anthropologists at all.