dry plates. Margaret made great improvements to their observatory equipment, and Margaret and William quickly rose to the forefront of spectroscopic astrophotography. Margaret worked alongside her husband William at the Tulse Hill observatory. At first, she is documented to being an assistant, but after extensive research into their observatory notebooks, this has been disproven. She conducted many of her own research projects, and was a collaborative assistant to William. After 1875, Margaret and William began a meticulous program of photographic experiments. During the 1880s, the pair were devoted to two projects; the first attempting to photograph the solar corona, and the second examining different Nebulae. The second project marked a milestone for Margaret, it was the first time she would be mentioned as the co-author of the paper alongside William. The Huggins' worked together for thirty-five years as equal collaborative investigative partners. Death and legacy After 30 years of devoting her life to Science, Margaret felt that she had contributed the best of her work. Margaret's husband, William Huggins died in 1910. She planned to write the biography of her late husband, but never succeeded. Margaret fell ill and underwent various surgeries and spent some time in hospital. Aware of her illness, she decided to donate her scientific and artistic treasures to Wellesley College in the United States. Margaret greatly admired the achievements of American women in the academic world and supported women's education. Margaret Huggins died on 24 March 1915, at the age of 66. She was cremated and her ashes laid next to William's at Golder's Green Crematorium. Margaret addressed in her will for a memorial to be erected in St. Paul's Cathedral, London, in honor of her husband. This memorial consists of a pair of medallions which are inscribed "William Huggins, astronomer 1824–1910" and the other "Margaret Lindsay Huggins, 1848–1915, his wife and fellow worker". There was a plaque established in 1997 that marks the house she grew up in on 23 Longford Terrace, Monkstown Dublin. Publications Obituary, William Lassell, 1880. Astronomical Drawing, 1882. Obituary, Warren de la Rue, 1889. On a new group of lines in the photographic spectrum of Sirius, 1890. The System of the Stars, 1890. On Wolf and Rayet's Bright-Line Stars in Cygnus, 1891. The Astrolabe, 1895. The Astrolabe. II. History, 1895. Spectroscopic notes, 1897. An Atlas of Representative Stellar Spectra from λ 4870 to λ 3300, 1899. Obituary, Agnes Mary Clerke, 1907.