“…BRITAIN AND MAINTENANCE OF THE ORGANISM Cattle R. bi(rneti has been isolated on numerous occasions from the pooled milk of herds of cattle kept in many parts of England, Wales, and Scotland (Marmion and Stoker, 1950;Slavin, 1952;Marmion et al, 1953;Evans, 1956;Grist, 1956). The survey by Slavin was the most comprehensive, and covered 3,374 herds, of which 6.9% in England, 2% in Wales, and 0.8°' in Scotland were infected as judged by the isolation of the rickettsia from the herd milk.…”