Monro was a polymath and polyglot who possessed considerable knowledge of music, painting and architecture. His favourite study was Homer, and his A Grammar of the Homeric Dialect (2nd ed., 1891) established his reputation as an authority on the subject. He edited the last twelve books of the Odyssey, with valuable appendices on the composition of the poem, its relation to the Iliad and the cyclic poets, the history of the text, the dialects, and the Homeric house; a critical text of the poems and fragments (Homeri opera et reliquiae, 1896); Homeri opera (1902, with T. W. Allen, in the Scriptorum Classicorum Bibliotheca Oxoniensis); and an edition of the Iliad with notes for schools.[1]
Monro's article on Homer, written for the 9th edition of the Encyclopædia Britannica, was revised by him for later versions before he died.[1] He also wrote The Modes of Ancient Greek Music (1894).
Upon Monro's death in 1905,[5] a number of his friends purchased, by subscription, over 1000 volumes from his library in his memory. These works were on Homeric studies and were mainly 19th century. They were presented to the Bodleian Libraries in Oxford.[6][7]
Monro himself had left Oriel College c.1000 volumes on comparative philology and mythology, most of which are now on permanent loan to the library of the Taylor Institution in Oxford.[8] He left his books on Greek Music and Mathematics, and editions of William Thackeray and Matthew Arnold, to friends.[9]