Jason König is Professor of Greek at the University of St Andrews. This is the third in a trilogy of volumes arising from a Leverhulme-funded research project, 'Science and Empire in the Roman World', which ran from 2007 to 2010 in St Andrews; the other two volumes, Ancient Libraries and Encyclopaedism from Antiquity to the Renaissance, were both published by Cambridge University Press in 2013. Greg Woolf is Professor of Classics and Director of the Institute of Classical Studies in London. He co-directed the project 'Science and Empire in the Roman World' at St Andrews and co-edited the two previous books resulting from it.