the minister of Lands and Forests William Finlayson to preserve from logging what became Killarney Provincial Park and Trout Lake. The latter was renamed O.S.A. Lake in honour of the Ontario Society of Artists which had taken it into trust. Jackson's efforts were rewarded with the naming of a lake after him on his 90th birthday. In 1938, Jackson visited the mine-site of the isolated Radium mine at Port Radium, Northwest Territories, in 1938. Jackson was a friend of prospector Gilbert LaBine, then the mine manager, and flew to the site with him, where he painted Radium Mine. During the Second World War, Jackson became one of the central figures in the development of the Canadian War Art Program in 1943. Working with the National Gallery of Canada, he played a pivotal role in organizing the largest public art project in Canadian history: the Sampson-Matthews silkscreen print program in 1942. Jackson left the Studio Building in 1955 with Lawren Harris mourning, in a letter from Vancouver, "Your moving from the Studio Building marks the end of an era, the one era of creative art that has the greatest significance for Canada... You were the real force and inspiration that led all of us into a modern conception that suited this country, and the last to leave the home base of operations." Group of Seven In 1919, Jackson and six painter colleagues formed the Group of Seven. These artists were considered to be bold, because the Canadian northern landscape had previously been considered too rugged and wild to be painted. Like the other members of the Group of Seven many of his works began as tiny en plein air sketches in oil on hardboard. Although his name is conventionally associated with this group, he would also remain something of a loner throughout his life. In 1925, he taught at the Ontario College of Art in Toronto; this was the only year that he missed his annual spring trip to Quebec. In 1933, Jackson, along with Harris, was a founding member of the Canadian Group of Painters. Several members of the Group of Seven became members of this group, including A. J. Casson, Arthur Lismer and Franklin Carmichael. Later years In 1943, Jackson first traveled to the Yukon with Henry George Glyde. He returned to the Yukon in 1964, this time with fellow artists Ralph Burton and Maurice Haycock, traveling by plane