Physics matters less than we once thought to the making of Mendel. But it matters more than we tend to recognize to the making of Mendelism. This paper charts the variety of ways in which diverse kinds of physics impinged upon the Galtonian tradition which formed Mendelism’s matrix. The work of three Galtonians in particular is considered: Francis Galton himself, W. F. R. Weldon and William Bateson. One aim is to suggest that tracking influence from physics can bring into focus (...) important but now little-remembered flexibilities in the Galtonian tradition. Another is to show by example why generalizations about what happens when ‘physics’ meets ‘biology’ require caution. Even for a single research tradition in Britain in the decades around 1900, these categories were large, containing multitudes. (shrink)

It is well established that intelligence testing in its modern form developed and was deployed slightly differently in several countries, most notably France, England and the United States. Less widely recognized is the fact that its originators were all part of a close network of scholars who liaised internationally, exchanged ideas and were thoroughly acquainted with each other’s work. Their exchanges resulted from the transnational drive to develop a new social science of psychology involving a determination to find empirical evidence (...) on which to base understandings of the human mind. This soon led to the development of a means of testing human performance, not least in the field of intelligence. In the process, close contacts between all those who were to be pioneers of intelligence testing around the globe developed, in touch with and feeding off each others’ ideas. This article is an account of the development of that network. (shrink)