BARNARD, JOSEPH EDWIN (187o– ), British phys icist, born in London, achieved considerable success in the science of microscopy. He carried out valuable work at the National Institute for Medical Research, Hampstead, London, where he was in charge of the department of applied optics, by co-operating with Dr. Gye in the demonstration in 1925 of the existence of the cancer virus. He held in addition the post of lecturer at King's college, London, and was president and honorary secretary of the Royal Microscopical Society, London. He was elected F.R.S. in 1924.