The ten years from 1788 to 1798, although a blank as regards her personal history—the Recollections cease with her brother’s marriage—were among the busiest of her life, and in the year last mentioned the Royal Society published two of her works, namely, “A Catalogue of 860 Stars observed by Flamsteed, but not included in the British Catalogue,” and “A General Index of Reference to every Observation of every Star in the above-mentioned British Catalogue.” It is in reference to these that she wrote the very interesting letter to the Astronomer Royal, which is given among others, in its place, in the Journal. But another work, which was not published, was the most valuable, as it was the most laborious of all her undertakings. This was “The 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.” It supplied the needful data for Sir John Herschel when he undertook the review of the nebulæ of the northern hemisphere; and it was for this that the Gold Medal of the Royal Astronomical Society was voted to her in 1828, followed by the extraordinary distinction of an Honorary Membership. This Catalogue was not completed until after her return to Hanover, and Sir David Brewster wrote of it as “a work of immense labour,” and “an extraordinary monument of the unextinguished ardour of a lady of seventy-five in the cause of abstract science.” [Sidenote: _Her Sweepings._] Although the Recollections cease in 1788, there are some volumes recording the nature and results of her nightly “sweepings,” which Miss Herschel kept very regularly, and, as an unique example of a lady’s journal, a few of the entries may be of interest. 1788. _Sept. 9th._—My brother showed me the five satellites of Saturn. He made me take notice of a star, which made a double star last night with the fifth satellite. * * * * * _Dec. 8th._—I swept for a comet which was announced in the papers as having been discovered the 26th of November by Mr. Messier. According to the observations of that date, it should have been within a few degrees of the Pole star (by my brother’s calculation), but though I swept with great attention a space of at least ten or twelve degrees all around the pole over repeatedly, I could find nothing. Another night of unavailing search, with thermometer 20°.[31] 1790. _Jan. 7th._—I have swept all this evening for my [third] comet in vain. My brother showed me the G. Sidus in the twenty-foot telescope, and I saw both its satellites very plainly. 1791. _Aug. 2nd._—I began to sweep at 1.30, from the horizon through the Pleiades up as high as the head of Medusa. Left off with β Tauri. Afterwards I continued with horizontal sweeps till daylight was too strong for seeing any longer.