leading libraries in the world. Nicholson instituted a number of reforms and improvements: he obtained further space for the library in the rooms of nearby buildings; he changed the system of cataloguing; more books were acquired; open access to some reference books in the Radcliffe Camera was introduced; and boys were employed to carry out some tasks, freeing up the time of the more experienced staff. However, these changes had internal opponents, including Falconer Madan, the senior Sub-Librarian (and Nicholson's eventual successor). The battles between Nicholson and some of his staff, which included anonymous complaints in newspapers, were an ongoing problem and affected Nicholson's health. One writer, however, later said of Nicholson, "I have always regarded him as almost the refounder of the Library". The library continued to suffer from inadequate space and money, but Nicholson made the most of the building and his staff, even though increasing the number of books added pressure on the available space. Nicholson proposed an underground book store in 1899 and work on this (the first specially-constructed underground book store to be built), along with other expansion work, began in 1907. However, by this time, his struggles and hard work had affected his health: he was confirmed as suffering from heart disease in 1890, he had a breakdown in 1901, and collapsed in the street in 1907 on two occasions. His last dispute with staff concerned his decision to appoint a woman to a permanent position. He was very reluctant to take a leave of absence from the library, suspecting motivations behind the suggestions, but finally did so less than a month before his death. Outside the library, he enjoyed chess, swimming, cycling, and writing limericks. He was noted for his kindness and consideration, and was particularly appreciated by junior staff at the library. He died at home in Oxford on 17 March 1912. Animal rights Nicholson was an early advocate of animal rights. He argued in his book, The Rights of an Animal (1879) that animals have the same natural right to life and liberty that human beings do, disregarding Descartes' mechanistic view—or what he called the "Neo-Cartesian snake"—that they lack consciousness. He argued that animals having no powers of reason is inconsistent with observations of household pets. Nicholson noted that animals like people, have nervous systems and experience pain and pleasure. He concluded that "animals have the same abstract rights of life