The sun's disc passes the true horizon of Linné on June 12, from 6h.4. to 7h 6 G.M.T.

Books received.-" Pamphlet of Extracts from the Thirteenth Volume of the Astronomical Observations at the Royal Observatory, Edinburgh. By C. Piazzi Smyth. Neill and Co., Edinburgh, 1872." Mrs. Marcet's Conversations on Natural Philosophy." Longmans, Green & Co., 1872. R. A. Proctor's "Essays on Astronomy." Longmans & Co.

6.

WANTED, APPIANI ASTRONOMIA, large folio.

ASTRONOMICAL REGISTER, Vols. I., II., III.

ASTRONOMICAL GEMS AND CURIOSITIES.-Apply to the Editor.

NOTICE.

JOHN OHN BROWNING begs respectfully to inform scientific gentlemen and the public generally, that he has taken the Premises, No. 63, Strand, opposite Bedford Street. These premises he will open as a West-End branch of his business on the 18th of March. In a Show-room on the ground floor there will be every convenience for testing, or seeing in action, Microscopes, Spectroscopes, Astronomical, Electrical, and other Philosophical Apparatus. There are light workshops on the premises. Communication has been established by electric telegraph with the Factory at 111, Minories. JOHN BROWNING, Optical and Physical Instrument Maker to the Royal Society, the Royal Observatories of Greenwich and Edinburgh, &c., &c., &c., 63, Strand, W.C.; 111, Minories, E.; and 6, Vine Street, E.C. Specialities, Spectroscopes, Astronomical Telescopes, Polariscopes, Microscopes, and Electrical Apparatus.

LATEST EDITION OF HERSCHEL'S "OUTLINES OF ASTRONOMY." In square crown 8vo, with 9 Plates, price 12s. cloth.

OUTLINES OF ASTRONOMY.

By SIR JOHN F. W. HERSCHEL, Bart., K.H., &c. New and Cheaper Edition (the Eleventh), as last corrected and brought up to the Existing State of Astronomical Knowledge by the Author.

"Sir J. Herschel's 'Outlines of Astronomy' is a book without which no professional or amateur astronomer can consider his library complete; and as a work of reference and authority, considering the eminent position attained in the science by its Author, its claims are very great indeed."-Astronomical Register.

London: LONGMANS, GREEN & Co., Paternoster Row.

MR. PROCTOR'S ASTRONOMICAL WORKS, in 8vo, with 10 Plates and 24 Woodcuts, price 12s. cloth.

ESSAYS ON ASTRONOMY; a Series of Papers on Planets

and Meteors, the Sun and Sun-surrounding space, Stars and Star cloudlets; and a dissertation on the approaching transit of Venus; preceded by a sketch of the life and work of Sir John Herschel. By RICHARD A. PROCTOR, B.A., Hon. Sec., Royal Astronomical Society.

THE SUN, with 10 Plates and 106 Woodcuts. Price 14s.

OTHER WORLDS THAN OURS. 10s. 6d.

SATURN AND ITS SYSTEM. 14s.

LIGHT SCIENCE FOR LEISURE HOURS. 7s. 6d.

NEW STAR ATLAS. Crown 8vo, 5s.

THE ORBS AROUND US. In a few days.

London: LONGMANS, GREEN & Co, Paternoster Row.

TO CORRESPONDENTS.

SMYTH'S CELESTIAL CYCLE.-Our Sydney Correspondent, whose exact address we have mislaid, is informed that we can procure a good copy of the above work for him on same subject.

NOTICE. It is particularly requested that all communications be addressed to the Editor, PARNHAM HOUSE, PEMBURY ROAD, CLAPTON. The Editor will be obliged if those gentlemen who have not paid their subscriptions will kindly send them by Cheque, Post-office Order, or penny postage stamps.

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The Astronomical Register is intended to appear at the commencement of each month; the Subscription (including Postage) is fixed at Three Shillings per Quarter, payable in advance, by postage stamps or otherwise. The pages of the Astronomical Register are open to all suitable communications. Letters, Articles for insertion, &c., must be sent to the Editor, Parnham House, Pembury Road, Clapton, E., not later than the 15th of the Month.