Later, Stevenson brought his wife home in August 1880. She was to him a perfect companion, taking part keenly and critically in his work, sharing all his gipsy tastes and love of primitive and natural modes of life, and being, in spite of her own precarious health, the most devoted and efficient of nurses in the anxious times which now ensued.
For the next seven or eight years Stevenson's life seemed to hang by a thread. Chronic lung disease had declared itself, and the slightest exposure or exertion was apt to bring on a prostrating attack of cough, hæmorrhage, and fever. The trial was manfully borne; and in every interval of respite he worked in unremitting pursuit of the standards he had set before himself.
Between 1880 and 1887 he lived the life of an invalid, vainly seeking relief by change of place. After spending six weeks (August and September 1880) with his parents at Blair Athol and Strathpeffer, he went in October, with his wife and stepson, to winter at Davos, where he made fast friends with John Addington Symonds (1840–1893) [q. v.] and his family. He wrote little, but prepared for press the collected essays ‘Virginibus Puerisque,’ in which he preaches with captivating vigour and grace his gospel of youth, courage, and a contempt for the timidities and petty respectabilities of life. For the rest, he amused himself with verses playful and other, and with supplying humorous text and cuts (‘Moral Emblems,’ ‘Not I,’ &c.) for a little private press worked by his young stepson. Returning to Scotland at the end of May with health somewhat improved, he spent four months with his parents at Pitlochry and Braemar. At Pitlochry he wrote ‘Thrawn Janet’ and the chief part of ‘The Merry Men,’ two of the strongest short tales in Scottish literature, the one of Satanic possession, the other of a conscience and imagination haunted, to the overthrow of reason, by the terrors of the sea. At Braemar he began ‘Treasure Island,’ his father helping with suggestions and reminiscences from his own seafaring experiences. At the suggestion of Mr. A. H. Japp, the story was offered to, and accepted by, the editor (Mr. Henderson) of a boys' periodical called ‘Young Folks.’ In the meantime (August 1881) Stevenson had been a candidate for the vacant chair of history and constitutional law at Edinburgh. In the light of such public reputation as he yet possessed, the candidature must have seemed paradoxical; but it was encouraged by competent advisers, including the retiring professor, Dr. Æneas Mackay. It failed. Had it succeeded, his health would almost certainly have proved unequal to the work. A cold and wet season at Braemar did him much harm; and in October he was ordered off to spend a second winter (1881–2) at Davos. He here finished the tale of ‘Treasure Island,’ began, on the suggestion of Mr. George Bentley, a life (never completed) of William Hazlitt, and prepared for press the collection of literary essays ‘Familiar Studies of Men and Books.’
In the summer of 1882 he again tried Scotland (Stobo Manse in Upper Tweedale, Lochearnhead, and Kingussie), and again with bad results for his health. As his wife was never well at Davos, they determined to winter in the south, and settled before Christmas in a cottage near Marseilles (Campagne Defli, St. Marcel). Thence being presently driven by a fever epidemic, they moved in January 1883 to a châlet in a pleasant garden on a hill behind Hyères (Châlet la Solitude). Here Stevenson enjoyed a respite of nearly a year from acute illness, as well as the first breath of popular success on the publication in book form of ‘Treasure Island.’ In this story the force of invention and vividness of narrative appealed to every reader, including those on whom its other qualities of style and character-drawing would in themselves have been thrown away; and it has taken its place in literature as a classic story of pirate and mutineer adventure. It has been translated into French, Spanish, and other languages. Partly at Marseilles and partly at Hyères he wrote the ‘Treasure of Franchard,’ a pleasant and ingenious tale of French provincial life; and early in 1883 completed for ‘Young Folks’ a second boys' tale, ‘The Black Arrow.’ This story of the wars of the Roses, written in a style founded on the ‘Paston Letters,’ was preferred to ‘Treasure Island’ by the audience to whom it was first addressed, but failed to please the critics when published in book form five years later, and was no favourite with its author. Stevenson's other work at Hyères consisted of verses for the ‘Child's Garden;’ essays for the ‘Cornhill Magazine’ and the ‘Magazine of Art’ (edited by Mr. Henley); the ‘Silverado Squatters,’ first drafted in 1880, and finally ‘Prince Otto.’ In this tale, or fantasy, certain problems of character and conjugal relation which had occupied him ever since his boyish tragedy of ‘Semiramis’ are worked out with a lively play of intellect and humour, and (as some think) an excessive refinement and research of style, on a stage of German court life and with a delightful background of German forest scenery. The book, never very popular, is one of those most characteristic of his mind. It was translated into French in 1896 by Mr. Egerton Castle.
In September 1883 Stevenson suffered a great loss in the death of his old friend Mr. James Walter Ferrier (see the essay Old Mortality). In the beginning of 1884 his hopes and spirits were rudely dashed by two dangerous attacks of illness, the first occurring at Nice in January, the second at Hyères in May. Travelling slowly homewards by way of Royat, he arrived in England in July in an almost prostrate condition, and in September settled at Bournemouth. In the autumn and early winter his quarters were at Bonallie Tower, Branksome Park; in February 1885 his father bought and gave him the house at Westbourne which he called (after the famous lighthouse designed by his uncle Alan) Skerryvore. This was for the next two years and a half his home. His health, and on the whole his spirits, remained on a lower plane than before, and he was never free for many weeks together from fits of hæmorrhage and prostration. Nevertheless he was able to form new friendships and to do some of the best work of his life.
In 1885 he finished for publication two books which his illness had interrupted, the ‘Child's Garden of Verses’ and ‘Prince Otto,’ and began a highway romance called ‘The Great North Road,’ but relinquished it in order to write a second series of ‘New Arabian Nights.’ These new tales hinge about the Fenian dynamite conspiracies, of which the public mind was at this time full, and to the old elements of fantastic realism add a new element of witty and scornful criminal psychology. The incidental stories of ‘The Destroying Angel’ and ‘The Fair Cuban’ were supplied by Mrs. Stevenson. During the same period he wrote several of the personal and literary essays afterwards collected in the volume ‘Memories and Portraits;’ a succession of Christmas stories, ‘The Body Snatcher’ in the ‘Pall Mall Gazette,’ 1884; ‘Olalla’ in the ‘Court and Society Review,’ and ‘The Misadventures of John Nicholson’ in ‘Cassell's Christmas Annual,’ both for 1885; and ‘Markheim’ in ‘Unwin's Christmas Annual,’ 1886; as well as several plays in collaboration with Mr. Henley, viz. ‘Beau Austin,’ ‘Admiral Guinea,’ and ‘Robert Macaire.’ Stevenson, like almost every other imaginative writer, had built hopes of gain upon dramatic work. His money needs, in spite of help from his father, were still somewhat pressing. Until 1886 he had never earned much more than 300l. a year by his pen. But in that year came two successes which greatly increased his reputation, and with it his power to earn. These were ‘The Strange Case of Dr. Jekyll and Mr. Hyde’ and ‘Kidnapped.’ The former, founded partly on a dream, is a striking apologue of the double life of man. Published as a ‘shilling shocker,’