"Newton's Dictionary of Birds, published in four parts by Adam & Charles Black, London, between 1893 and 1896, and as a single bulky volume in 1896 was his magnum opus (Dawson 2008), a monumental work that inspired awe and admiration from all reviewers. ... Newton's main achievements are threefold: (1) helping to initiate the British Ornithologists’ Union and its journal The Ibis, (2) promoting the conservation of birds and (3) his Dictionary of Birds."