In 1851 he began to study law and was admitted a Fellow of Corpus Christi College. In 1856 he travelled to America and visited Lake Superior and the upper St. Croix River, canoeing down it to the Mississippi. Sclater wrote about this in "Illustrated travels". In Philadelphia he met Spencer Baird, John Cassin and Joseph Leidy at the Academy of Natural Sciences. After returning to England, he practised law for several years and attended meetings of the Zoological Society of London.
Sclater was the founder and first editor of The Ibis, the journal of the British Ornithologists' Union. He was Secretary of the Zoological Society of London from 1860 to 1902. He was briefly succeeded by his son, before the Council of the Society made a long-term appointment.
In 1901 he described the okapi to western scientists although he never saw one alive. His office at 11 Hanover Square became a meeting place for all naturalists in London. Travellers and residents shared notes with him and he corresponded with thousands.
His collection of birds grew to nine thousand and these he transferred to the British Museum in 1886. At around the same time the museum was augmented by the collections of Gould, Salvin and Godman, Hume, and others to become the largest in the world.
Among Sclater's more important books were Exotic Ornithology (1866–69) and Nomenclator Avium (1873), both with Osbert Salvin; Argentine Ornithology (1888–89), with W.H. Hudson; and The Book of Antelopes (1894–1900) with Oldfield Thomas.
On 16 October 1862 Sclater married Jane Anne Eliza Hunter Blair, daughter of Sir David Hunter-Blair, 3rd Baronet; the couple had a daughter and four sons.[8] Their eldest son, William Lutley Sclater, was also an ornithologist. Their third son, Captain Guy Lutley Sclater, died on 26 November 1914, aged 45, in the accidental explosion that sank HMS Bulwark. Philip Sclater is buried in Odiham Cemetery.[9]
Although eclipsed by his contemporaries (like Charles Darwin and Alfred Russel Wallace), Sclater may be considered as a precursor of biogeography and even pattern cladistics. For instance he writes in 1858 that "...little or no attention is given to the fact that two or more of these given geographical divisions may have much closer relations to each other than to any third ...".[11]
^Beolens, Bo; Watkins, Michael; Grayson, Michael (2011). The Eponym Dictionary of Reptiles. Baltimore: Johns Hopkins University Press. xiii + 296 pp. ISBN978-1-4214-0135-5. ("Sclater", p. 239).