visited remote, almost unpopulated regions far inland. Most of the people he encountered had never seen a Westerner or camera before. His expeditions were also especially challenging because he had to transport his bulky wooden camera, many large, fragile glass plates, and potentially explosive chemicals. He photographed in a wide variety of conditions and often had to improvise because chemicals were difficult to acquire. His subject matter varied enormously: from humble beggars and street people to Mandarins, Princes and senior government officials; from remote monasteries to Imperial Palaces; from simple rural villages to magnificent landscapes. Later life Thomson returned to England in 1872, settling in Brixton, London, and, apart from a final photographic journey to Cyprus in 1878, Thomson never left again. Over the coming years he proceeded to lecture and publish, presenting the results of his travels in the Far East. His publications started initially in monthly magazines, followed by a series of large, lavishly illustrated photographic books. He wrote extensively on photography, contributing many articles to photographic journals such as the British Journal of Photography. He also translated and edited Gaston Tissandier's 1876 History and Handbook of Photography, which became a standard reference work. In London, Thomson renewed his acquaintance with Adolphe Smith, a radical journalist whom he had met at the Royal Geographical Society in 1866. Together they collaborated in producing the monthly magazine, Street Life in London, from 1876 to 1877. The project documented in photographs and text the lives of the street people of London, establishing social documentary photography as an early type of photojournalism. The series of photographs was later published in book form in 1878. He was elected a member of the Photographic Society, later the Royal Photographic Society, on 11 November 1879. With his reputation as an important photographer well established, Thomson opened a portrait studio in Buckingham Palace Road in 1879, later moving it to Mayfair. In 1881 he was appointed photographer to the British Royal Family by Queen Victoria, and his later work concentrated on studio portraiture of the rich and famous of High Society, giving him a comfortable living. From January 1886 he began instructing explorers at the Royal Geographical Society in the use of photography to document their travels. After retiring from his commercial studio in 1910, Thomson spent most of his time back in Edinburgh, although he continued to write papers for the Royal Geographical Society on