As all the world knows, Mr. Herschel (then Sir William) was long recognised as the most celebrated astronomer of the time. And while none rejoiced more in his proud position than his sister, he was ever ready to acknowledge his indebtedness to her, as his companion in his herculean toils. The marvel is that the constant and exhausting strain of many long years did not prematurely wear out the strength and brain of both. They, however, grew old together, and alike lived to a remarkable old age. Sir William, who was twelve years the senior, was the first whose splendid constitution gave way. He died in the year 1822. After her brother's death Miss Herschel, then in her 72nd year, seems to have felt unsettled in England and unable to face the scenes and life she had for so many years shared with her brother. Notwithstanding her attachment to her sister-in-law and her favourite nephew (who in some measure took the place in her affections of her beloved brother), she decided to return to Hanover. An absence of half a century from any place makes a wonderful difference in its associations, and Miss Herschel lived to regret her return to her native city, where, however, she resided for the remainder of her life. If her work by her brother's side was done, her long evening of life was, nevertheless, one of grateful recollection and laborious industry. Among other tasks, she undertook and completed a "Reduction and Arrangement, in the form of a catalogue in zones, of all the Star Clusters and Nebulæ observed by Sir W. Herschel in his Sweeps." For this she was, at a meeting of the Royal Astronomical Society in 1828, awarded the gold medal of the Society. The remarks made by Mr. South, the Vice-President, on that occasion, perhaps best summarise her great achievements. He said: "The labours of Miss Herschel are so intimately connected with, and are generally so dependent upon, those of her illustrious brother, that an investigation of the latter is absolutely necessary ere we can form the most remote idea of the extent of the former. But when it is considered that Sir W. Herschel's contributions to astronomical science occupy sixty-seven memoirs, communicated from time to time to the Royal Society, and embrace a period of forty years, it will not be expected that I should enter into their discussion. To the Philosophical Transactions I must refer you, and shall content myself with the hasty mention of some of her more immediate claims to the distinction now conferred. To deliver an eulogy, however deserved, upon _his_ memory is not the purpose for which I am placed here.... But when we have thus enumerated the results obtained in the course of _sweeps_ with this instrument, and taken into consideration the extent and variety of the other observations which were at the same time in progress, a most important part yet remains untold. Who participated in his toils? Who braved with him the inclemency of the weather? Who shared his privations? A female.