Before leaving Scotland for Jamaica, Macneill had commenced a poem, founded on a Highland tradition; and to the completion of this production he assiduously devoted himself during his homeward voyage. It was published at Edinburgh in 1789, under the title of "The Harp, a Legendary Tale." In the previous year, he published a pamphlet in vindication of slavery, entitled, "On the Treatment of the Negroes in Jamaica." This pamphlet, written to gratify the wishes of an interested friend, rather than as the result of his own convictions, he subsequently endeavoured to suppress. For several years, Macneill persevered in his unsettled mode of life. On his return from Jamaica, he resided in the mansion of his friend, Mr Graham of Gartmore, himself a writer of verses, as well as a patron of letters; but a difference with the family caused him to quit this hospitable residence. After passing some time with his relatives in Argyllshire, he entertained a proposal of establishing himself in Glasgow, as partner of a mercantile house, but this was terminated by the dissolution of the firm; and a second attempt to succeed in the republic of letters had an equally unsuccessful issue. In Edinburgh, whither he had removed, he was seized with a severe nervous illness, which, during the six following years, rendered him incapable of sustained physical exertion. With a little money, which he contrived to raise on his annuity, he retired to a small cottage at St Ninians; but his finances again becoming reduced, he accepted of the hospitable invitation of his friends, Major Spark and his lady, to become the inmate of their residence of Viewforth House, Stirling. At this period, Macneill composed the greater number of his best songs, and produced his poem of "Scotland's Skaith, or the History of Will and Jean," which was published in 1795, and speedily gained him a wide reputation. Before the close of twelvemonths, it passed through no fewer than fourteen editions. A sequel, entitled "The Waes o' War," which appeared in 1796, attained nearly an equal popularity. The original ballad was composed during the author's solitary walks along the promenades of the King's Park, Stirling, while he was still suffering mental depression. It was completed in his own mind before any of the stanzas were committed to paper. The hope of benefiting his enfeebled constitution in a warm climate induced him to revisit Jamaica. As a parting tribute to his friends at Stirling, he published, in 1799, immediately before his departure, a descriptive poem, entitled "The Links of Forth, or a Parting Peep at the Carse of Stirling," which, regarded as the last effort of a dying poet, obtained a reception fully equal to its merits.