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A class of pupils raking hay in the open air at Dr Rollier's Sun... News Photo1920-1929,Agriculture,Archival,Black And White,Finance,Hay,Haystack,Healthcare And Medicine,Horizontal,Males,Medicine,Rake,Rural Scene,Switzerland,WindPhotographer Collection: Hulton Archive circa 1925: A class of pupils raking hay in the open air at Dr Rollier's Sun School in Switzerland. Swiss physician Dr Rollier achieved a substantial cure rate for tuberculosis sufferers by exposure to sunlight or 'heliotherapy'. (Photo by General Photographic Agency/Getty Images)