Professor Dr. Angelo Celli, director of the institute of hygiene, University of Rome, Italy. He was, up to the time of his very recent death, one of the foremost living workers in hygiene. His investigations and those of his colleagues and students were almost simultaneous with those of Ronald Ross in India, and largely through his personal instrumentality malaria has been enormously reduced in Italy. The Roman Campagna has once more been made habitable and the health of the peasants has very greatly improved.