SOTfrEttAN & CO., 140, STKANB, W.C., AND 43, PICCADILLY, W. 483 



9617 HUXLEY (Thomas Henry, F.R.S.) OBSERVATIONS on the STRUCTURE of GLACIER ICE, Svo. 

 (pp. 20), sewn, 2s 1857 



9618 PHYSIOGRAPHY : an Introduction to the Study of Nature, first edition, with 5 coloured 



plates, and 122 woodcuts, cr. Svo. cL, 3s (p. 7s Qd) 1877 



9619 , PORTRAIT of, engraved on steel by CHARLES HENRY JEENS, 4s n. d. 



9620 THE SAME, PROOF BEFORE LETTERS, 6s 



9621 THE SAME, on INDIA PAPER, 85 



9622 HUYGENS [Latine HUGENIUS] (Christiaan ; F.R.S.) (EuvRES COMPLETES, publiees par la 

 SOCI^TE HOLLANDAISE DBS SCIENCES ; printed on handmade paper, with 4 portraits, 50 plates and 

 fss., and numerous other illustrations, 12 thick vols. 4to. parchment cover, uncut, 10. 105 (p. F. 390 

 nett) La Haye, 1888-1910 



CONTENU : Tomes I a X : Correspondance de 1638 & 1695 : Tomes XI eh XII : Travaux Mathematiques,' 1654-56. 

 A national memorial to one of the greatest of Dutchmen, and the indispensable edition of his Works for any great 

 scientific library. 



9623 OPERA VARIA [cum Vita sua, ex Recensione G. J. 's GRAVESANDE] ; with engraved portrait 



by F. Ottens, and5Q plates, 2 vols. 4to. in 1, sound copy in old calf, 16s Qd Lugduni Batavorum, 1724 



Including Horologiutn Oscillatorium ; Theoremata de Quadratura Hyperboles, Ellipsis et Circuli ; de Circuli 

 Magnitudine Inventa ; de Circuli et Hyberbolae Quadratura, etc. etc. 



9624 EADEM ; necnon, OPERA RELIQUA [edente G. J. 's GRAVESANDE] ; with 58 copperplates, 



2 v., Amst., '284 vols. 4to. hf. calf gilt, 1. 12s Qd 1724-8 



9625 OPUSCULA POSTUMA, quse continent DIOPTRICAM, COMMENTARIOS de VITRIS FIGURANDIS, 



DlSSERTATIONEM de CORONA et PARHELIIS, TRACTATUM de MOTU et de Vl CENTRIFUGA, Dfi- 



SCRIPTIONEM AUTOMATI PLANETARii [ex Recensione BURCHERI DE VOLDER et BERNHARDI 

 FULLENII] ; with 24 fine copperplates (many folding), and numerous diagrams, sm. 4to. con- 

 temporary calf (RARE), 18s Qd Lugd. Bat., 1703 



FIRST EDITION of the author's posthumous works, afterwards republished by J. W. 's Gravesande as Opera Reliqua, and 

 comprising Huygens's important optical works. 



' In his Posthumous Works, 1703, he shewed how from the focal lengths of the component lenses the magnifying power 

 of a telescope could be determined ; and explained some of the phenomena connected with haloes and parhelia.' W. W.E.Bali. 



9626 De CIRCULI MAGNITUDINE INVENTA, accedunt eiusdem Problematum quorundam illus- 



trium Constructiones, editio princeps ; with numerous diagrams, sm. 4to. sewn (large and sound 

 copy) ; RARE, 1. 5s ib., Joh. et Dan. Elzevier, 1654 



9627 EXERCITATIONES MATHEMATICS et PHILOSOPHIC^:, ex MSS. in Bibliotheca Academic 



Lugd. Bat. servatis edidit PETRUS JOANNES UYLENBROEK ; with 4 folding plates and fs., 2 vols. 

 4to. sewn, uncut (scarce), 12s Qd Hagce Comitum, 1833 



Containing Huygens's scientific correspondence with Leibniz, the Marquis de 1'Hospital, de Vaumesle, Fatio de 

 Duillier, etc. etc. 



BROOK TAYLOR'S COPY: 



9628 HOROLOGIUM OsciLLAT9RiUM, sive de MOTU PENDULORUM ad Horologia aptato 



Demonstrationes Geometricse, editio princeps ; with woodcuts and numerous diagrams, folio, 

 new boards (a few slight wormholes and water-stains on margin, but a TALL AND SOUND COPY) ; 

 with auto, of Brook Taylor, F.R.S. ? inventor of the calculus of finite differences, on title 

 (VERY RARE), 4. 4s Parisiis, F. Muguei, Regis typographus, 1673 



'A work that ranks second only to Newton's Principia and constitutes historically a necessary introduction to it. 

 The book opens with a description of pendulum clocks, of which Huygens is the inventor. Then follows a treatment of 

 accelerated motion of bodies falling free, or sliding on inclined planes, or on given curves culminating in the brilliant 

 discovery that the cycloid is a tautochronous curve. To the theory of curves he added the important theory of ' evolntes.' 

 ... In Huygens's assumption that the common centre of gravity of a group of bodies, oscillating about a horizontal axis, 

 rises to its original height, but no higher, is expressed for the first time one of the most beautiful principles of dynamics, 

 afterwards called the principle of the conservation of vis viva. The 13 theorems at the end relate to the theory of 

 centrifugal force in circular motion. This theory aided Newton in discovering the law of gravitation. 'Prof. Cajori. 



' This work contains the first attempt to apply dynamics to bodies of finite size and not merely to particles.' 

 W. W. R. Ball. 



9629 KOSMO9EQPOS, sive de TERRIS CCELESTIBUS, earumque Ornatu, CONJECTURE, ad 



Constantinum Hugenium, Fratrem : Gulielmo III. Magnse Britannise Kegis, a Secretis ; editio 

 princeps; with 5 folding plates, and plate IV in duplicate, sin. 4to. old white vellum (binding 

 slightly damaged] ; RARE, 1. Is Hagce-Com., 1698 



9630 EDITIO ALTERA ; with 5 plates, sm. 4to. old hf. vellum (FINE COPY), 15s ib., 1699 



Published posthumously. It contains the author's views on the plurality of worlds, and the first attempt at stellar 

 photometry by comparing the light of the Sun with that of Sirius. 



9631 The CELESTIAL WORLDS Disco VER'D : or, Conjectures concerning the Inhabitants, 



Plants and Productions of the Worlds in the Planets, with 5 folding plates, large 12mo. fine copy 

 in contemporary panelled calf (rare], 15s T. Childe, 1698 



9632 ANOTHER COPY, old calf (back slightly damaged), 12s 



9633 SECOND EDITION, corrected and enlarged, with 5 folding plates, 12mo. old mottled calf, 



newly rebacked (FINE COPY), 12s 1722 



9634 ANOTHER COPY, unbound (plate 4 wanting), 5s 



9635 HYDRO-MECHANICS, The THEORY and PRACTICE of : Lectures at the Institution of Civil 

 Engineers, with 6 folding plates and maps and 23 woodcuts, Svo. hf. calf neat (o. p.), 10s Qd 1885 



9636 ANOTHER COPY, sewn, 8s Qd 



Containing Physiography, by SIR JOHN EVANS ; Water-Supply, by WILLIAM POLE, F.R.S. ; Water-Motors, by W. C. 

 UNWIN, F.R.S. ; Inland Navigation in Europe, by SIR C. A. HARTLEY ; Tides and Coast Works, by THOMAS STEVENSON ; 

 and Forms of Ships, by SIR E. J. REED, F.R.S. 



9637 HYSLOP (Jonathan, C.E.) COLLIERY MANAGEMENT, 2nd [last] Edition, with front, and 

 2 folding charts, also Atlas, containing 17 folding plates 2 vols. Svo. cl. (o. p.), Qs (p. 1. 5s) 1876 



