HENRY SOTHERAN & CO., 140, STRAND, W.C., and 37, PICCADILLY, W. 233 



5564 [YOUNG (John "Radford, Belfast College)] Letter to the Earl of Clarendon in reference to 

 the Mathematical Professorship in the Queen's College for Ulster, by the late Professor of 

 Mathematics in Belfast College, 8vo. (pp. 42), sewriy 2s 6d [1850] 



The very curious and remarkable story of the author's extrusion as an Episcopalian from his chair by the party deter- 

 mined ' to make the College Presbyterian from the porter to the Principal '. All the other non-Presbyterian professors 

 shared the same fate, though the college was nominally undenominational. 



5565 Mathematical Dissertations, for the Use of Students in the Modern Analysis, with 



Improvements in the Practice of Sturm's Theorem in the Theory of Curvature, and in the 

 Summation of Infinite Series, 8vo. cl. (scarce), 5s 1841 



5566 Mathematical Tables, comprehendinj; the Logarithms of all Numbers from 1 to 30,600, 



and the Natural and Logarithmic Sines and Tangents, computed to 7 Places of Decimals, with 

 other Tables useful in Navigation, etc. etc., narrow 8vo. cl., 2s 1839 



5567 Navigation and Nautical Astronomy, in Theory and Practice, with Attempts to 



facilitate the Finding of the Time and the Longitude at Sea, diagrams, fcap. 8vo. boards, 2s 1855 



5568 On the Theory and Solution of Algebraical Ecjuations, with the recent Researches 



of BuDAN, Fourier, and Sturm, on the Separation of the Real and Imaginary Roots of Equations, 

 post 8vo. cL, or, hf. calf, 2s 6d 1835 



5569 Second Edition, enlarged, 8vo. cl., 5s 1843 



' Young rendered important service to English mathematical study by familiaring students with continental methods 

 of analysis. In 1S49, on the opening of (Queen's CoUego, the Presbyterian party which controlled the professional nomina- 

 tions prevented Young's reappointment as professor in the new establishment. From that time he devoted himself more 

 completely to the .study of mathematical analysis, and made several original discoveries '. — D. X. B. 



5570 YOUNG (Thomas, m.d., f.r.s.) Miscellaneous Works : Vols. I and II, including his 

 Scientific Memoirs, etc., edited by George Peacock, f.r.s.. Dean of Ely, and v. Ill, Hiero- 

 glyphical Essays, and Correspondence, etc., ed. by John Leitch, with medallion portrait, and 

 numerous steel plates and woodcuts, 3 thick vols. 8vo. cl., uncut (scarce), £1. 10» 1855 



5571 Another Copy, 3 vols., with Life by Dean Peacock, with fine mezzotint portrait after 



Sir T. Lawrence— i vols. 8vo. cl , or, hf. calf, £2. 2s 1855 



The 'Scientific Memoirs' contain all the author's contributions to the ' Philo.sophical Transactions 'of the Royal Society, 

 and most of his articles in the Encyclopedia Britannica, Nicholson's and Brande's Journals, the Quarterly Review, and 

 Essays issued in ditferent publications. They form, t<igether with the 1845 Edition of the • Lectures ', with which they are 

 uniform in size, a complete collection of his works on natural science. 



5572 Course of Lectures on Natural Philosophy and the Mechanical Arts, first 



edition, with 5^ fine copperplates (2 coloured) ^2 thick vols. 4to. boards, uncut (SCARCE), £1. 10s 1807 



5573 Another Copy, 2 vols, tree-calf, newly and neatly rebacked, £1. 15* 



The rare original edition, containing much matter left out in the edition of 1845, vi:., ' Mathematical Elements of 

 Natural Philoscphy, deduced from Axiomatical Principles' (pp. SO), the valuable 'Catalogue of Works relating to Natural 

 Philosophy, and the Mechanical Arts ' (pp. 434), and ' Miscellaneous Papers, reprinted [from the Philosophical Trans- 

 actions], with Corrections ' (pp. 162), vith 15 extra plates. 



5574 New Edition, with References and Notes, by Philip Kelland, pr., f.r.s., with iSfine 



folding plates on copper (2 coloured), besides woodcuts, 2 vols. 8vo. cl., 158 1845 or n. d, 



5575 Other Copies, 2 vols. hf. calf gilt, or, calf, 16s 6d 



6576 Another Copy, 2 vols. hf. morocco extra (fine copy), £1. 1* 



Containing the author's important investigations, giving his discovery of astigmatism, and of the principle of inter- 

 ference, which finally established the undulatory theory of light ; his theory of the tides, explaining more tidal phenomena 

 than any other ad/anced before, his theory of capillary action, his researches in physiological optics, making him 

 the founder of that science, etc. etc. 



[ ] Elementary Illustrations of the Celestial Mechanics of Laplace— v. Nos. 2447-8. 



6577 Observations on Vision, with copperplates by Basire, 4to. (pp. 13), unbound, 5s 1793 



The author's first work, which led to his election as F.R.S., in which he attributes the accommodating power of the 

 eye to a muscular structure of the crystalline lens. 



' He was one of the most clear-sighted men who have ever lived, but he had the misfortune to be too greatly superior in 

 sagacity to his contemporaries. They gazed at him with astonishment, but could not always follow the bold flights of his 

 intellect, ami thus a multitude of his most important ideas lay burled and forgotten . . , till a later generation in tardy 

 advance remade his discoveries and convinced itself of the accuracy and force of his inferences '.—//elni?ioi<z. 



5578 ZACH (Franz Xaver Freiherr v.) Astronomical Observations, plate, 4to. (pp. 16), sewn, 

 2s 1784 



5579 Correspondance Astronomique, G6ographique, Hydrographique, et Statistique; 



with plates and tables, 15 vols. 8vo. in 14, boards (VERY scarce), £6. 65 Grnes, 1818-26 



a completc set, containing vol. 15, consisting of one number, which is often raLssing. This valuable publication con- 

 tains contributions by Bessel, Encke, G. B. Giordano, Littrow, Olbkrs, Plana, Santini, Ad.ml. W. H. Smvtu, and the 

 Editor. 



5580 Nouvelles Tables d'ABERRATiON et de Nutation, pour 1,404 ^toiles, avec una 



Table gdn^rale d* Aberration pour les Planfetes et les Comfetes, etc. etc. etc., 8vo. sewn, with 

 author's inscr. to L. Ciccolini, As Qd Marseille, 1812 



• In 1812 de Zach gave an important extension of his previous labours by the publication of tables of aberration and 

 nutation.'— Pro/. R. Grant. 



5581 Tables Abr^g^es et Portatives de la Lune, calcul^es pour le M6ridien de Paris d'apres 



la Theorie de Laplace et les Constantes et Coetticiens de Burg, cr. 8vo. hf. calf, 35 Florence, 1809 



5582 A Large Paper Copy, sq. 8vo. sewn, 3* 6rf 



5583 Tables Abregees et Portatives du Soleil, calculees pour le M^ridien de Paris sur les 



Observations les plus r^centes d'apres la Theorie .de M. La Place, 8vo., Large Paper ; sewn, 

 with author's inscr. to L. Ciccolini, 3* 6d ibidem, 1809 



5584 ZALLINGEB (Johann Baptist, s.J.) De Ortu Frugum Dissertatio, ex Mechanismo 

 Plantaruni deducta, propugnatur cum Positionibus ex Universa Physica a Josepho de 

 Sterzinger, 8vo. old calf, As CEniponti, 1769 



5585 ZECH (Julius) Tafeln der Additions- und Subtractions-Logarithmen fUrsiKBENSTELLEN, 

 2. Autlage, roy. 8vo. hf. calf, 2s ed Berlin, 1863 



