CONTENTS. 1836.—Bessel’s Refraction Tables. Table for converting Errors of R. A. and N.P.D. into Errors of Longitude and Ecliptic P. D. 1837.—Logarithms of Sines and Cosines to every Ten Seconds of Time. Table for converting Sidereal into Mean Solar Time. 1842.—Catalogue of 1439 Stars. 1847.—Twelve Years’ Catalogue of Stars. 4. —— MAGNETICAL AND METEOROLOGICAL OBSERVATIONS. 1840 to 1847. Royal 4to. 50_s._ each. 5. —— ASTRONOMICAL, MAGNETICAL AND METEOROLOGICAL OBSERVATIONS, 1848, 49, & 50. Royal 4to. 50_s._ each. 6. —— REDUCTION OF THE OBSERVATIONS OF PLANETS. 1750 to 1830. Royal 4to. 50_s._ 7. —— —— LUNAR OBSERVATIONS. 1750 to 1830. 2 Vols. Royal 4to. 50_s._ each. 8. BERNOULLI’S SEXCENTENARY TABLE. _London_, 1779. 4to. 5_s._ 9. BESSEL’S AUXILIARY TABLES FOR HIS Method OF CLEARING LUNAR DISTANCES. 8vo. 10. —— FUNDAMENTA ASTRONOMIÆ: _Regiomonti_. 1818. Folio. 60_s._ 11. BIRD’S Method OF CONSTRUCTING MURAL QUADRANTS. _London_, 1768. 4to. 2_s._ 6_d._ 12. —— Method OF DIVIDING ASTRONOMICAL INSTRUMENTS. _London_, 1767. 4to. 2_s._ 6_d._ 13. COOK, KING, AND BAYLY’S ASTRONOMICAL OBSERVATIONS. _London_, 1782. 4to. 21_s._ 14. EDWARDS ON THE COMPOSITION OF METALS FOR REFLECTING TELESCOPES. 8vo. 2_s._ 6_d._ 15. EIFFE’S ACCOUNT OF IMPROVEMENTS IN CHRONOMETERS. 4to. 2_s._ 16. ENCKE’S BERLINER JAHRBUCH, FOR 1830. _Berlin_, 1828. 8vo. 9_s._ 17. GROOMBRIDGE’S CATALOGUE OF CIRCUMPOLAR STARS. 4to. 10_s._ 18. HARRISON’S PRINCIPLES OF HIS TIME-KEEPER. PLATES. 1767. 4to. 5_s._ 19. HUTTON’S TABLES OF THE PRODUCTS AND POWERS OF NUMBERS. 1781. Folio. 7_s._ 6_d._ 20. LAX’S TABLES FOR FINDING THE LATITUDE AND LONGITUDE. 1821. 8vo. 10_s._ 21. LUNAR OBSERVATIONS at GREENWICH. 1783 to 1819. Compared with the Tables, 1821. 4to. 7_s._ 6_d._ 22. —— DISTANCES of the MOON’S CENTRE from the PLANETS, 1822, 3_s._; 1823, 4_s._ 6_d._ 1824 to 1835. 8vo. 4_s._ _each_. 23. MASKELYNE’S ACCOUNT OF THE GOING OF HARRISON’S WATCH. 1767. 4to. 2_s._ 6_d._ 24. MAYER’S THEORIA LUNÆ JUXTA SYSTEMA NEWTONIANUM. 4to. 2_s._ 6_d._ 25. —— TABULÆ MOTUUM SOLIS ET LUNÆ. 1770. 4to. 5_s._ 26. —— ASTRONOMICAL OBSERVATIONS MADE AT GOTTINGEN, from 1756 to 1761. 1826. Folio. 7_s._ 6_d._ 27. NAUTICAL ALMANACS, from 1767 to 1855. 8vo. 2_s._ 6_d._ each. 28. —— SELECTIONS FROM THE ADDITIONS, up to 1812. 8vo. 5_s._—1834-54. 8vo. 5_s._ 29. —— SUPPLEMENTS, 1828 to 1833, 1837 and 1838. 8vo. 2_s._ each. 30. —— TABLES requisite to be used with the N. A. 1766. 8vo. 2_s._ 6_d._ 31. —— _Second Edition, enlarged._ 1781. 8vo. 5_s._ 32. —— _Third Edition, corrected._ 1802. 8vo. 5_s._ 33. POND’S ASTRONOMICAL OBSERVATIONS. 1811 to 1835. 4to. 21_s._ each. 34. RAMSDEN’S ENGINE for DIVIDING MATHEMATICAL INSTRUMENTS. 4to. 5_s._ 35. —— ENGINE for DIVIDING STRAIGHT LINES. 4to. 5_s._