Continent world ultimately persisted with these being regarded as separate continents. From the late 18th century, some geographers started to regard North America and South America as two parts of the world, making five parts in total. Overall though, the fourfold division prevailed well into the 19th century. Europeans discovered Australia in 1606, but for some time it was taken as part of Asia. By the late 18th century, some geographers considered it a continent in its own right, making it the sixth (or fifth for those still taking America as a single continent). In 1813, Samuel Butler wrote of Australia
Wings of a Continent the "Canada Carries On" series, "Wings of a Continent" was produced in 35 mm for the theatrical market and also released as "Les" "Ailes d'un Continent," a version dubbed in French. Each film was shown over a six-month period as part of the shorts or newsreel segments in approximately 800 theatres across Canada. When shown in Ottawa, the reviewer commented that, "The strategic significance of air transportation in Canada in a world now totally at war is graphically described in the December release of the National Film Board's 'Wings of a Continent'." Along with others in the "Canada Carries On"