Irvine's major work of scholarship was a 1907 translation and edition of a chronicle of the Venetian traveller
Niccolao Manucci. After
François Bernier, Manucci was the main contemporary European authority for the history of India during the reign of
Aurangzeb (1658–1707). Manucci's work was known at the end of the 19th century only in a garbled French version. Over eight years, Irvine discovered a Berlin codex that gives a part of the text, and a Venice manuscript that supplies its entirety. Manucci had dictated his work in Latin, French, Italian, and Portuguese. In India, Irvine was known as an authority on the provincial laws of rent and revenue. In 1868, while still an assistant, he published his
Rent Digest, a summary of the rent law of the province. In 1879, he produced a history of the Afghan Nawabs of
Fatehgarh, or
Farrukhabad (
Journ. Asiatic Soc. of Bengal, 1879). Upon returning to Britain, he began a history of the decline of the Mogul empire, planned as beginning from the death of Aurangzeb in 1707 to the capture of
Delhi by
Lord Lake in 1803. Chapters appeared in the
Journal of the Asiatic Society of Bengal between 1896 and 1908. In the end, the history did not extend further than the accession of
Mahomed Shah in 1719. Related papers appeared in the
Journals of the Royal Asiatic Society of London and the
Asiatic Society of Bengal, the
Asiatic Quarterly Review, and the
Indian Antiquary; and in 1903, Irvine published
The Army of the Indian Moghuls: its organisation and administration. Irvine also contributed in 1908 the chapter on Mogul history to the new
Gazetteer of India. His last significant publication was a life of Aurangzeb in the
Indian Antiquary for 1911; a résumé appeared the same year in the ''Encyclopédie d'Islam''. ==Family==