By the above, you will see it will be very near 19 of Comæ Berenices to-night, and it will be a curious observation if it should prove an occultation of one of the stars of the Comæ. Notice has been given to astronomers at home and abroad of the discovery. I shall continue to observe it, and will give you by-and-by a further account of it. In the meanwhile believe me to be, with much gratitude and regard, Dear Miss Herschel, Your most obedient and obliged humble servant, ALEX. AUBERT. P.S.—I was glad to hear to-day, by my friends at our club, that they had seen you last night in good health; pray let me know what news you have of your brother, and when we may expect to see him. I have had twice at Loam Pit Hill his serene highness the Duke of Saxe Gotha, and entertained him, Count Bruhl, and Mr. Oriani (a Milanese astronomer), with your comet last night. My sisters return you many thanks for your kind remembrance, and, with their best compliments, enjoin me to wish you joy. [Sidenote: 1786. _Employments at Slough._] MISS HERSCHEL TO DIETRICH HERSCHEL. SLOUGH, _August 4, 1786_. DEAR BROTHER,— We received yesterday William’s and Alexander’s letter, and find that they intend to leave Hanover on the 8th of August, therefore they will not see the contents of this. However, as you have an instrument, I think you are entitled to information of a telescopic comet which I happened to discover on the 1st of August, and which I found, by the observations of the 2nd, to have moved nearly three-quarters of a degree. Last night it was cloudy, but I hope the weather will be more favourable another night, that we may see a little more of it. I believe you have a pair of Harris’s maps; the place where I saw the comet is between 53 and 54 Ursæ Maj. and the 14, 15, and 16 Comæ Ber. of Flamsteed’s Catalogue. All stars of Flamst. are in Bode’s Cat. to be found, and if you cannot do without it, I dare say it is to be met with at Hanover.... I found it with a magnifier of about 30, with a field of about 1½ degree. Now, if you have a piece which is nearly like this, I would advise you to make use of that in sweeping all around this place, for it must be, by the time you receive this letter, at a considerable distance. When I saw it, it appeared like a very bright, but round, small nebula. The first letter I received from Hanover from William gave us the greatest satisfaction imaginable, for it contained an account of the good health of all our dear relations. I hope our dear mother does not grieve too much now they have left her. I dare say William will pay soon another visit, and then I will take that opportunity of coming to see her. Farewell, dear brother; give my best love, &c.