In his new book “Hearsay Is Not Excluded; A History of Natural History,” Prof. Michael R. Dove takes up the histories of four representative natural historians from the previous four centuries – Georg Eberhard Rumphius, Carl Linnaeus, Alfred Russel Wallace, and Harold C. Conklin – to examine how their own studies were undertaken in times and socio-cultural circumstances when crossing today’s more fortified disciplinary boundaries was not only allowed but expected.