of university in 1880 or 1885. If he began university at age 17, his birth year could be as late as 1868. Museums and special collections For the 1951 Festival of Britain, Holmes's living room was reconstructed as part of a Sherlock Holmes exhibition, with a collection of original material. After the festival, items were transferred to The Sherlock Holmes (a London pub) and the Conan Doyle collection housed in Lucens, Switzerland by the author's son, Adrian. Both exhibitions, each with a Baker Street sitting-room reconstruction, are open to the public. In 1969, the Toronto Reference Library began a collection of materials related to Conan Doyle. Stored today in Room 221B, this vast collection is accessible to the public. Similarly, in 1974 the University of Minnesota founded a collection that is now "the world’s largest gathering of material related to Sherlock Holmes and his creator". Access is closed to the general public, but is occasionally open to tours. In 1990, the Sherlock Holmes Museum opened on Baker Street in London, followed the next year by a museum in Meiringen (near the Reichenbach Falls) dedicated to the detective. A private Conan Doyle collection is a permanent exhibit at the Portsmouth City Museum, where the author lived and worked as a physician. Postcolonial criticism The Sherlock Holmes stories have been scrutinized by a few academics for themes of empire and colonialism. Susan Cannon Harris claims that themes of contagion and containment are common in the Holmes series, including the metaphors of Eastern foreigners as the root cause of "infection" within and around Europe. Lauren Raheja, writing in the Marxist journal Nature, Society, and Thought, claims that Doyle used these characteristics to paint eastern colonies in a negative light, through their continually being the source of threats. For example, in one story Doyle makes mention of the Sumatran cannibals (also known as Batak) who throw poisonous darts, in "The Adventure of the Devil's Foot" a character employs a deadly West African poison, and in "The Speckled Band" a "long residence in the tropics" was a negative influence on one antagonist's bad temper. Yumna Siddiqi argues that Doyle depicted returned colonials as "marginal, physically ravaged characters that threaten the peace," while putting non-colonials in a much more positive light. Adaptations and derived works The popularity of Sherlock Holmes has meant that many writers other than Arthur Conan Doyle have created tales of the detective