The paintings have deteriorated significantly since they were rediscovered, and a number of 19th-century copies and drawings are important for a complete understanding of the works. A number of attempts to copy the Ajanta paintings began in the 19th century for European and Japanese museums. Some of these works have later been lost in natural and fire disasters. In 1846 for example, Major Robert Gill, an Army officer from Madras Presidency and a painter, was appointed by the Royal Asiatic Society to make copies of the frescos on the cave walls. Gill worked on his painting at the site from 1844 to 1863. He made 27 copies of large sections of murals, but all but four were destroyed in a fire at the Crystal Palace in London in 1866, where they were on display. Gill returned to the site, and recommenced his labours, replicating the murals until his death in 1875.