Photographs of British Algae is a landmark in the histories both of photography and of publishing: the first photographic work by a woman, and the first book produced entirely by photographic means. Instantly recognizable today as the blueprint process, the cyanotypes lend themselves beautifully to illustrate objects found in the sea. The Library's copy of British Algae originally belonged to Sir John Herschel (1792-1871), inventor of the blueprint process, among his many other photographic as well as scientific advances. One of thirteen known copies of the title, Photographs of British Algae was acquired in 1985 at auction directly from Herschel's descendants.