1792. _May 3rd._—My brother having desired me by way of practice to settle the stars α Persei and Castor, and α Virginis, by some neighbouring stars in Wollaston’s Catalogue, I made last night an attempt to take their places. The moon was near the full, therefore no sweeping could be done. 1795. _May 1st._—_Mem._ In the future when any great chasms appear in my journals, it may be understood that sweeping for comets has not been neglected at every opportunity which did offer itself. But as I always do sweep according to the precept my brother has given me, and as I often am in want of time, I think it is very immaterial if the places where I have seen nothing are noted down. _Nov. 7th._—0.40 sidereal time. About an hour ago I saw the comet [seventh] which is marked in the annexed field of view [diagrams drawn with extreme neatness illustrate the entries when necessary]. When I perceived it first the two small stars were entirely covered by it, and it appeared to be a cluster of stars mixed with nebulosity; but not knowing of such an object in that place, I kept watching it, and perceived it to be a comet by its having moved from the two small stars, so as to leave them entirely free from haziness. 1797. _Aug. 14th._—C. H.’s comet. At 9.30 common time, being dark enough for sweeping, I began in the usual manner with looking over the heavens with the naked eye, and immediately saw a comet nearly as bright as that which was discovered by Mr. Gregory, January 8, 1793. I went down from the observatory to call my brother Alexander, that he might assist me at the clock. In my way into the garden I was met and detained by Lord S. and another gentleman, who came to see my brother and his telescopes. By way of preventing too long an interruption, I told the gentlemen that I had just found a comet, and wanted to settle its place. I pointed it out to them, and after having seen it they took their leave. [Sidenote: 1822. _Retrospection._] These entries were continued with great regularity to the year 1819, at which time, as the Diary shows, Sir William’s increasing feebleness made her close daily attendance more necessary, and her pen was in greater request than the “sweeper.” The last volume concludes with a carefully drawn eye-draft of the situation of a comet visible at Hanover, January 31st, 1824. Thenceforth the instrument which had done such good service in her hands for forty years of steady work, became the chief ornament of her sitting-room, until her disquieting fears for its ultimate fate led her to send it back to England.