But exceptional as were the honors conferred on her by sovereigns and learned societies, none of them afforded her the extreme satisfaction that she experienced on the receipt of a copy, shortly before her death, of her nephew's epochal _Cape Observations_; for, as has well been said, "nothing in the power of man to bestow could have given such pleasure on her death-bed as this last crowning completion of her brother's work." We are told that a copy, just from the press, of his immortal work, _De Orbium Celestium Revolutionibus_, in which he had established the heliocentric theory of the planetary system, was placed in the hands of Copernicus on the day of his death, just a few hours before he expired. He seemed conscious of what it was; but, after touching it and contemplating it for a moment, he lapsed into a state of insensibility which soon terminated in death. With Miss Herschel the case was different. Although in her ninety-seventh year, she still retained possession of all her faculties and was fully able to appreciate the volume which told of the crowning of her brother's life work--a volume which must have given her additional satisfaction when she recalled her fifty years of loyal service at her brother's side as his associate and ministering angel in the greatest work ever undertaken by a single man in the history of astronomy. Caroline Herschel died at the advanced age of ninety-seven years and ten months, retaining to the last her interest in astronomy which had occupied her mind for more than three-quarters of a century. Her epitaph, composed by herself, is engraved on a heavy stone slab which covers her grave and contains the following words: "The eyes of her who is glorified were here below turned to the starry heavens. Her own discoveries of comets and her participation in the immortal labors of her brother, William Herschel, bear witness of this to future ages." Space precludes any extended reference to Miss Herschel's distinguished associate in the Royal Astronomical Society, Mrs. Somerville, whose masterly translation and exposition of Laplace's _Mecanique Celeste_ secured for her so enviable a place among the mathematicians of her time, and placed all English students of mathematical astronomy under such deep obligations. It is true that she ever manifested a lively interest in celestial phenomena; but it is rather as a mathematician than as an astronomer that she will be remembered by the devotees of science.