Altogether the constitution of the Milky Way in its whole extent, from Scorpio to Argo Navis, is extremely curious and interesting. I have already collected a pretty large catalogue of southern nebulæ, for the most part hitherto unobserved, but my most remarkable object is a fine planetary nebula of a beautiful greenish-blue colour, a full and intense tint (not as when one says Lyra is a _bluish_ star, &c.), but a positive and evident blue, between indigo-blue and verditer green. It is about 12ʺ in diameter, exactly round, or a _very_ little elliptic, and quite as sharply defined as a planet. Its place is 11^h 42^m R.A., and 146° 14ʹ N.P.D. My review for double stars goes on in moonlight nights, and among them I may mention γ Lupi and ε Chameleontis as among the closest and most interesting. I have been hunting for Halley’s comet by Rümker’s Ephemeris in Taurus, but without success, though in the finest sky, quite dark, and with a newly-polished mirror. (By the way, I should mention that I have not had the least difficulty in my polishing work, and my mirrors are now more perfect than at any former time since I have used them.) My last comet hunt was Feb. 18. I shall, however, continue to look out for it. Pray mention this to Schumacher, who is Rümker’s next-door neighbour. MISS HERSCHEL TO A. DE MORGAN, ESQ., SECRETARY OF ROYAL ASTRONOMICAL SOCIETY. _March 9, 1835._ SIR,— I return you many thanks for your communication of being chosen an Honorary Member of the Royal Astronomical Society, and beg you will do me the favour to convey my most heartfelt thanks to the honourable gentlemen of the Council for conferring so great an honour on me; and only regret that at the feeble age of 85 I have no hope of making myself deserving of the great honour of seeing my name joined with that of the much distinguished Mrs. Somerville. I beg you will believe me to remain, with great regard, Sir, your most respectful and obliged humble servant, CAROLINE HERSCHEL. [Sidenote: 1835. _Catalogues of Stars._] MISS HERSCHEL TO F. BAILY, ESQ. HANOVER, _April 2, 1835_. DEAR SIR,—