Thomas Stevenson was married to Margaret Isabella, youngest daughter of the Rev. Lewis Balfour, for many years minister of the parish of Colinton in Midlothian. This Mr. Balfour (described by his grandson in the essay called _The Manse_) was of the stock of the Balfours of Pilrig, and grandson to that James Balfour, professor first of moral philosophy and afterwards of the law of nature and of nations, who was held in particular esteem as a philosophical controversialist by David Hume. His wife, Henrietta Smith, a daughter of the Rev. George Smith of Galston, to whose gift as a preacher Burns refers scoffingly in the _Holy Fair_, is said to have been a woman of uncommon beauty and charm of manner. Their daughter, Mrs. Thomas Stevenson, suffered in early and middle life from chest and nerve troubles, and her son may have inherited from her some of his constitutional weakness. Capable, cultivated, companionable, affectionate, she was a determined looker at the bright side of things, and hence better skilled, perhaps, to shut her eyes to troubles or differences among those she loved than understandingly to compose or heal them. Conventionally minded one might have thought her, but for the surprising readiness with which in later life she adapted herself to conditions of life and travel the most unconventional possible. The son and only child of these two, Robert Louis (baptized Robert Lewis Balfour[3]), was born on November 13, 1850, at 8 Howard Place, Edinburgh. His health was infirm from the first, and he was with difficulty kept alive by the combined care of his mother and a most devoted nurse, Alison Cunningham; to whom his lifelong gratitude will be found touchingly expressed in the course of the following letters. In 1858 he was near dying of a gastric fever, and was at all times subject to acute catarrhal and bronchial affections and extreme nervous excitability. In January 1853 Stevenson's parents moved to Inverleith Terrace, and in May 1857 to 17 Heriot Row, which continued to be their Edinburgh home until the death of Thomas Stevenson in 1887. Much of the boy's time was also spent in the manse of Colinton on the Water of Leith, the home of his maternal grandfather. Ill-health prevented him getting much regular or continuous schooling. He attended first (1858-61) a preparatory school kept by a Mr. Henderson in India Street; and next (at intervals for some time after the autumn of 1861) the Edinburgh Academy.