'Looking Backward', London, early 20th century.
© NMeM / Royal Photographic Society / Science & Society Picture Library
Gelatin silver print. Photograph by Horace W Nicholls of a procession of men filing out of the the Royal Academy of Arts at Burlington House in Piccadilly. They are possibly volunteers in the Artists' Rifles regiment, off to fight in the First World War. Burlington House was the regimental headquarters.