HENRY SOTHERAN & CO., 140, STRAND, W.C, and 43, PICCADILLY, W. 641 



12842 OSTWALD (Wilhelm, Univ. Leipzig ; Nobel Laureate) Chemische Fernewirkung, 8vo. 



(pp. 14), sewn, Is 6d ' [Leipzigy 1891] 



12843 Manual of Physico-Chemical Measurements, translated with the Author's Sanction 



by James Walker; f.r.s., with 188 woodcuts, and tables in pocket, 8vo. cl. {scarce), 10s 6rf 1894 

 Both the English and German Editions of this work are now out of print and scarce. 



12844 Outlines of General Chemistry, translated, with the Author's Sanction, by James 



Walker, f.r.s., 58 icoodcuts, 8vo. cl., 5s (p. 10s nett) 1890 



12845 The Principles of Inorganic Chemistry, translated, with the Author's Sanction, by 



Alexander Findlay, 2nd Edition, ivith 126 illustrations, thick 8vo. cl., 10s (p. 18s nett) 1904 



12846 The Scientific Foundations of Analytical Chemistry, treated in an Elementary 



Manner, translated with the Author's Sanction by George McGowan, 2nd Edition, cr. Svo., cl., 

 3s 6d (p. (>s nett) 1900 



12847 Solutions: being the Fourth Book, with some Additions, of the Second Edition of 



• Lehrbuch der allgemeinen Chemie ', translated by M. M. Pattison Muir, with 35 illustrations, 

 Svo. cl. (scarce), 15s 1891 



12848 Verwandtschaftslehre, I. Teil [Geschichte der Verwandtschaftslehre. Chemische 



Dynamik], 2. umgearbeitete [neueste] Auflage ; with 389 illustrations, thick 8vo. sewn, £1. 

 (p. M. 29 nett) Leipzig, 1911 



12849 Die Wissenschaftlichen Grundlagen der Analytischen Chemie elementar 



dargestellt, 5. umgearbeitete [neueste] Auflage ; toith 3 illustrations, large post Svo. c/., 5s (p. M. S) 



ibid., 1910> 



12850 O'TOOLE (John) AusA Dynamica, concerning Force, Impulsion, and Energy, Svo. sewn, 

 with author's inscr., 2s 6d Dublin, 1884 



12851 Improved and Enlarged Edition, with diagrams, Svo. sewn, with author's insrr., 3s 



ibid., 1886 



12852 OUDEMANS (Antoon Cornelis; Delft) Over den Invloed van Optisch Inactieve 

 Oplosmiddelen op het Soortelijk Draaiingsvermogen van Optisch Actieve Stoffen;. 

 unt/i folding plate, Svo. (pp. 31), sewn, 4s (id Amsterdam, 1872 



An important memoir in which the author first shows that optically active alkaloids show equal rotation in equivalent 

 concentrations. The author is generally confused with his brother the astronomer {infra). 



12853 OUDEMANS (Jan Abraham Christiaan ; Univ. Utrecht) Bericht aangaande de 

 Waarnemingen, gedaan by Gelegenheid der Totale Zonsverduistering van 12 December 

 1871 ; with folding plate, roy. Svo. (pp. 30), sewn, Is Qd z. p. [1872] 



12854 Gemakkelijke Methode, den Stand van den Spiegel van eenen Patentcirkel van 



PiSTOR en Martins te bepalen en te rectificeren ; ivith folding plate, roy. Svo. (pp. 18), 

 sewn, ls6rf [Batavia, 1865} 



12855 HISTORISCH OVERZICHT over de Onderzoekingen, in de laatste Dertig Jaren 



verricht, bij Gelegenheid van ToTALE Zoneklipsen, roy. Svo. (pp. 20), sewn. Is 6rf [ibidem], 1871 



12356 Nader Berigt omtrent het Terugvinden van de Komeet van Brorsen, cr. Svo. 



(pp. 4), unbound, ivith author's inscr.. Is {Utrecht, 1857] 



12857 On the Retrogradation of the Plane of Saturn's King and of those of his 



Satellites whose Orbits coincide with that Plane, Svo. (pp. 12), sewn. Is 1888 



1285S Uebersicht der in den letzten 60 jahren ausgefiihrten Bestimmungen von 



FixsTERNPARALLAXEN, 4to. (pp. 12), sewn, Is Crf Kiel [1889] 



12859 Vergelijking der Waarde in de Tables de la Lune van Hansen aan den Straal 



der Maan toegekend, en de Waarden, door de naauwkeurigste Bepalingen gegeven, roy. Svo^ 

 (pp. 25), sewn, with author's inscr.. Is ^d [Batavia, 1859] 



12860 Waarnemingen op de Komeet van 1858, gedaan te Batavia, 4to. (pp. 16), sewn, 3s Qd 



[ibidem, 1859} 



12861 OUGHTRED (William; pr., King's Coll., Cantab.) Clavis Mathematic^e denuo limata, 

 sive potius fabricata, cum aliis quibusdam ejusdem Commentationibus ; Editio IV. auctior et 

 emendatior ; with numerous diagrams, \2mo. fine copy in contemporary white vellum (RARE), 17s Qd 



Oxoniae, Typis Lichfieldianis, 1667 

 ' His Clavis Mathcmaticae is a good systematic text-book on arithmetic, and contains practically all that was then 



known on the subject. In this work he introduced the symbol x for multiplication. He also introduced the symbol : : 



in proportion : previously to his time a proportion such a : b = c : d was usually written a - b - c - d ; he denoted it 



a.b: : c .d.'—W. W. E. Ball. 



This erlition includes the following treatises by the same author, each with a separate titlepage and pagination : 



Elementi X. Euchdis Declaratio, nee non de Solidis Regularibus Tractatus, '62: Theoreniatum in Libris Archimedis de 



Sphitra et Cylyndro Declaratio, '(53 : Horologiorum Scioticorum in Piano, Geometrice solum, sine Calculo Trigonometrica, 



delineandorum, Modus Facillimus, '63. 



According to the preface the work was revised by John Wallis, f.r.s., and the treatise on dialling translated into 



Latin by Sir Christopher Wrkn. 



12862 [ ] The DESCRIPTION and Use of the Double Horizontall Dyall . . . and of the 



Generall Horologicall King (1652)— v. Nos. 7608 and 10772-4, ante. 



12863 : Mr. William Oughtred's Key of the Mathematicks, newly translated from the 



Best Edition, with Notes rendring it Easie and Intelligible to less Skilful Headers, in which also, 

 some Problems left Unanswer'd by the Author are Resolv'd. Recommended by Mr, E. Halley, 

 F.R.S. [with Preface by him], unth numerous diagrams, 12mo. old calf, or, old calf, newly rebacked, 

 12s 6rf John Salusbury, 1694 



The best English Translation. ' This Translation is New and from the fullest Edition, and may be of gooil use to 

 all Beginners in the Analytical Art.'— />r. Halley's Preface. 



' Oughtred's Clavis is a book of arithmetic as well as of algebra, and one of great celebrity. The editions which follow 

 the first, besides other additions, have the solution of adfected equations, or Vieta's method. Throughout the old, or 

 scratch method of division, is retained '.—Prof, de Morgan. 



