HENRY SOTHERAN & CO., 140, STRAND, W.C., and 43, PICCADILLY, W. 439 



8648 GREENWICH OBSERVATIONS : —Astronomical, Magnetical and Meteorological 

 Observations at the Royal Observatory, Greenwich, under the Direction of Sir George 

 BiDDELL Airy, Sir William Henry Mahoney Christie, ff.r.s., and others, from 1873 to 1908, 

 36 vols., with Extra Publications as under, 13 v.— in all 49 vols, thick impl. 4to. cL, £8. 8* 

 (p. £44.) 1875-1910 



List of Extra Publications :— Astrophysical Catalogue 1900'0, Greenwich Section, Dec. + 64° to 90% 2 plates, 2 v., 

 '04-8: Telegraphic Determination of Longitude, 1888-1902, 7 plates, '06: New Redaction of Groombridge's Circuinpolar 

 Catalogue for 1810*0, by F. W. Dyson, f.r.s., and W. G. Thackeray, f.r.a.s., portrait and plate, '05: Photo-Heliographic 

 Results, 1874-85, '07 : Observations of the Planet Eros, 1900-1, front., etc., '03 : Nine-Year and Ten-Year Star Catalogues for 

 1872, 1880, 1890, and 1900, 4 v., 1876-1909: Reduction of Greenwich Meteorological Observations, pts. I, HI— IV(pt. It 

 forming part of ' Observations ' for 1887), plates, 3 v., '78-1906. 



8649 Another Set, from 1896 to 1907, 12 v. : with the Extra Publications as above (except 



♦Photo-Heliographic Results,' and 'Meteorological Observations,' pt. IV), li v. — in all 23 vols, 

 impl. 4to. cL, £5. 5* (p. £19. 65) 1878-1909 



8650 : AsTROGRAPHic Catalogue, 1900*0. Greenwich Section, Dec. + 64° to 90°, from 



Photographs taken and measured at the Royal Observatory, Greenwich, 2 plates, and diagrams, 

 2 thick vols. impl. 4to. cl., £1. 5s (p. £3.) Edin., 1904-8 



8651 GREGAN-CBAUFURD (Alexander Quintin, pr.) Essay on the Development of Func- 

 tions, 8vo. (pp. 34), sewn (scarce), 45 1844 



' All the ordinary and fundaiiiental developments are here obtained by a new method.'— Preface. 



8652 GREGORIUS a Sto. VINCENTIO, s.j. : Opus Geometricum de Quadratura Circuli et 

 Section UM Coni X Libris comprehensum ; with fine engraved title, and 7iumerous diagrams 

 (pp. c. 1200) : SARASA (Alfcnsus Antonius de, s.j.) Solutio Problematis a R. P. Marino 

 Mersenno propositi (pp. 35)— -2 vols. roy. folio in 1, old calf gilt, newly rebacked (rare), £1. 1856c? 



Antverpice, 1647-9 

 'Gregory St. Vincent is the greatest of circle-squarers, and his investigations led him into many truths: he found 

 the property of area of the hyperbola which led to Napier's logarithms being called hyperbolic. Montucla says of him, 

 with sly truth, that no one has ever squared the circle with so much genius, or, excepting his principal object, with so 

 much success. His reputation, and the many merits of his work, led to a sharp controversy on his quadrature, which 

 ended in its complete exposure by Huygens and others.'— Pro/, de Morgan. 



' He discovered the expansion of log (1 + x) in ascending powers of a;. . . . In the Opus Geometricum he used 

 indivisibles.'— IT. IV. R. Ball. 



His method ductals plani in planum, employed in Book VII of the above work, is important in connexion with the 

 invention of the differential calculus. 



8653 Opus Geometricum Posthumum ad Mesolabium per Rationum Proportionalium 



Novas Proprietates. Finem Operis Mors Authoris antevertit ; with numerous diagrams, large 

 folio, /we copy in old ca(/" (rare), £1. 1* Gandavi, 1668 



' Son objet etoit I'invention des deux moyennes proportionnelles continues, probleme qu'il poursuit a travers une 

 multitude de propositions, et de propri^t^s nouvelles des propositions et proportionnalit^s, des figures rectilignes, des 

 sections coniques, et surtout de I'hyperbole rapportee k ses asymptotes ; mais I'ouvrage n'^tant pas termine, on ne salt 

 pas si son auteur avoit, k regard de ce problSme, la meme pretention que sur la quadrature du cercle. '—i»fo»(ucZa. 

 8654 GREGORY ^David; f.r.s., Savilian Prof. Astronomy, Oxon.) AsTRONOMIiE Physics et 

 Geometric^ Elementa, Editio II., revisa et correcta, accesserunt Prsefatio Editoris [C. Huarti 

 (pp. 63)], Cometographia Halleiana, brevis ad Calcem Horologiorum Sciotericorum 

 TRACTATUS [auctore C. HUARTO], et Index duplex ; with front, and 46 plates, 2 vols. 4to. in 1, 

 contemporary calf gilt (rare), £1. 5s Genevce, 1726 



This finely printed edition is specially valuable for containing the first reprint of the now very rare ' Astronomiie 

 Cometicse Synopsis' by Edmund Hallky, f r.s. 



' It was the first textbook composed on gravitational principles, and remodelling astronomy in conformity with 

 physical theory. Newton thought highly of it, and communicated for insertion in it his ' lunar theory ', long the guide of 

 practical astronomers in determining the moon's motions. The discussion in the preface, in which the doctrine of 

 gravitation was brought into credit on the score of its antiquity, likewise emanated from Newton.'— D. N. B. 



8655 The Elements of Astronomy, Physical and Geometrical, done into English, with 



Additions and Corrections, with Dr. H alley's Synopsis of the Astronomy of Comets, with 

 numerous plates, 2 vols. 8vo. old panelled calf, 8s 6d 1715 



First English edition of the foregoing work, including the English version of Halley's ' Synopsis of the Astronomy of Comets. ' 



8656 Catoptrics et DioPTRiCiE Spherics Elementa, editio princeps; udth 3 folding 



plates, 12mo. sound copy in contemporary sheep (RARE), £1. 10s Edinhurgi, 1713 



' A concluding remark (p. 98), as to the possibility of counteracting colour-aberration in lenses, by combining in them 

 media of diff"erent densities, gave the first hint of the achromatic telescope.' — Miss Agnes M. Gierke. The suggestion was 

 realised in 1757 by the invention of the achromatic lens by John Dollond, f.r.8. 



8657 Treatise of Practical Geometry, translated, mth Additions [by Colin Maclaurin, 



F.R,s.] ; 7th Edition, with 5 copperplates, 8vo. sewn, 4* ib., 1769 



8658 GREGORY (James, f.r.s.) Geometric Pars Universalis, inserviens Quantitatum Curv- 

 ARUM Transmutationi et Mensur^E; with numerous diagrams^ sm. 4to. sewn, {large and 

 sound copy) ; rare, 12« 6rf Patavii, 1668 



' In the Qeometrice Pars the author explained how the volumes of solids of re volution can be determined '—W. W. R. Ball. 



8659 Optica Promota, sen abdita Rsidiorum Reflexorum et Refractorum Mysteria, Geometrice 



enucleata ; cui subnectitur Appendix, subtilissimorum Astronomiae Problematwn Resolutionem 

 exhibens, editio princeps; with numerous diagrams, sm. 4to. LARGE AND SOUND COPY in 

 contemporary calf {VERY RARE), £2. 12s 6d Londini, J. Hayes, pro S. Thomson, 1663 



' Containing the first feasible description of a reflecting telescope, his invention of which dated from 1661. It con.sistfd 

 essentially of a perforated parabolic speculum in which the eye-piece was inserted with a 8n)all elliptical mirror, placed in 

 front to turn back the image. The first Gregorian telescope was presented to the Royal Society by Robert Hooke in 1674, 

 and the same form was universally employed in the XVIIIth Century.'— D. N. B. 



' The utility of the transits of the inferior planets in furnishing an accurate method of determining the value of the 

 solar parallax was first pointed out by James Gregory in his Optica Promx)ta, in 1663.'— Pro/. R. Grant, F.R.S. , 



8660 GREGORY (John, c.E.) Complete (jourse of Civil Engineering, comprising; Plane Trigo- 

 nometry, Surveying, and Levelling, with their Application, 5 folding plates, and numerous 

 other illustrations, 8vo. roan, Ss 6d [1842] 



