Periodicals played a vital role in the developments in science and medicine that transformed nineteenth-century Britain. Proliferating from a mere handful to many hundreds of titles, they catered to audiences ranging from gentlemanly members of metropolitan societies to working-class participants in local natural history clubs. In addition to disseminating authorized scientific discovery, they fostered a sense of collective identity among their geographically dispersed and often socially disparate readers by facilitating the reciprocal interchange of ideas and information. As such, they offer privileged access into the workings of scientific communities in the period. The essays in this volume set the historical exploration of the scientific and medical periodicals of the era on a new footing, examining their precise function and role in the making of nineteenth-century science and enhancing our vision of the shifting communities and practices of science in the period. This radical rethinking of the scientific journal offers a new approach to the reconfiguration of the sciences in nineteenth-century Britain and sheds instructive light on contemporary debates about the purpose, practices, and price of scientific journals.