IN the Beama journal of November reference is made to Le Corbusier's city of the future consisting of dwellings, offices, and factories contained in huge blocks separated by gardens. One of the main features of this modern city is the large part of its activity which takes place underground. Power stations, garages, warehouses and other public service buildings, as well as traffic routes for vehicles and pedestrians, would be constructed in this way. Already there exists a plan for the diversion of a large part of the Paris traffic, the underground routes for which were examined by the Minister of Public Works some years ago. Électricité published a report on this subject by M. Roger d'Arboville, professor of applied electricity in the well-known École spéciale d'Architecture, on the lighting of underground traffic and pedestrian routes. He reviews the practice exemplified in some of the short subways in Paris, in the long road tunnel projected for 1941 under the Meuse, the mile-long roadway under the Eseaut at Antwerp and various railway tunnels in France and England.