Contained within the 3rd Edition (1957) of the Atlas of Canada is a plate consisting of four condensed maps that show urban populations of the people living in Canada. The two maps at the top of this plate show the night-time distribution of population, circa 1956 for Metropolitan Toronto and part of Montreal Island. These two maps actually show the distribution of persons in their permanent homes, without adjustments for such persons that may be absent from their homes at night. Persons in short term, transient residence, such as those in hotels and hospitals are not represented. Another map shows the distribution of urban population across Canada, circa 1951. The definition of urban includes all persons residing in cities, towns and villages of 1000 population or more, whether incorporated or unincorporated, as well as the population of all parts of the census metropolitan areas. A smaller scale map of Canada shows urban areas. These are areas in which urban communities of 1000 or more population