It is a Biographical Book. This book describes the memories of Mary Somerville from Early Life to Old Age. The life of a woman entirely devoted to her family duties and to scientific pursuits affords little scope for a biography. There are in it neither stirring events nor brilliant deeds to record; and as my Mother was strongly averse to gossip, and to revelations of private life or of intimate correspondence, nothing of the kind will be found in the following pages. It has been only after very great hesitation, and on the recommendation of valued friends, who think that some account of so remarkable and beautiful a character cannot fail to interest the public, that I have resolved to publish some detached Recollections of past times, noted down by my mother during the last years of her life, together with a few letters from eminent men and women, referring almost exclusively to her scientific works. A still smaller number of her own letters have been added, either as illustrating her opinions on events she witnessed, or else as affording some slight idea of her simple and loving disposition.