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BAILY (Francis) Astronomical Tables and Formulæ, together with a variety of Problems explanatory of their use and application, to which are prefixed the Elements of the Solar System, 8vo, boards, 1827, 17s. 6d.

CHAMBERS (G. F.) Handbook of Descriptive Astronomy, 3rd edition, with 34 plates, 8vo, cloth, 1877, £1 4s.

DE MORGAN (Augustus, F.R.A.S.) Budget of Paradoxes (reprinted, with the Author's Additions, from the Athenæum), large 8vo, cloth, scarce, 1872, £2 2s.

GILBERT'S DE MAGNETE.—Gvilielmi Gilberti Colcestrencis, Medici Londinensis, De Magnete, magneticisque corporibus, et de magno magnete tellure; Physiologia nova, plurimis et argumentis, et experimentis demonstrata. Londini excudebat Petrus Short, Anno MDC, pp. 14 and 240, numerous engravings of Gilbert's Electrical Experiments, small folio, old calf, very scarce, 1600, £5 5s.

GOULD (B. A.) Resultados del Observatorio Nacional Argentino en Cordoba. Uranometria Argentina; Brightness and Position of every Fixed Star down to the Seventh Magnitude within 100 degrees of the South Pole, text, 4to, 388 pp., and atlas, folio, containing 14 Star Charts (forming Vol. I. of the Resultados), in English and Spanish, Buenos Aires, 1879 £4 4s.

GOULD (B. A.) Resultados del Observatorio Nacional Argentino en Cordoba. Vols. VII., VIII., Zone Catalogue,