46G HENRY SOTHERAN & CO., 140, STRAND, W.C, and 43, PICCADILLY, W. 



9239 [HERSCHEL (Sir John Frederick William, f.r.s. ; son of Sir William)] The Telescope 

 (Encyclopaedia Britannica), ivith 28 ivoodcutSy 4to. (pp. 29), boards^ 4s [1859] 



9240 Treatise on Astronomy, with vignette, 3 plates by Adlardj and diagrams, 12mo.cl., 



3s ' 1833 



9241 New Edition, ivith vignette^ S plates, and diagrams, 12mo. h. russia, 3s 1837 



9242 Traite d' ASTRONOMIE, traduit et augmente d'un Chapitre sur rApplication de la 



Th^orie des Chances a la Serie des Orbites des Cometes, par A. Cournot, 2^ Edition, icith 3 

 plates, and diagrams, 12mo. hf. calf gilt, 3s Qd 1836 



9243 Traite de la Lumiere, traduit avec Notes, par P. H. Verhulst et A. Quetelet ; idth 



15 plates, 2 vols. 8vo. calf gilt {nice copy), 9s 1829-33 



This work, originally published in the Encyclopedia Metropolitana, has never been published in English in a separate 

 form. ' This admirable treatise, translated into French by Quetelet, besides including many original discoveries, gave 

 European currency to the undulatory theory of light.'— Miss Agnes M. Gierke. 



9244 Two Letters to the Editor of the Athenaeum, on a British Modular Standard of 



Length, 8vo. (p. 8), seivn, 2s 1863 



9245 [ , and Charles BABBAGE, f.r.s.] IVIemoirs of the Analytical Society, 1813, roy. 



4to. original ivrappers, uncut (very scarce), £1. 5s Cambridge, 1813 



The only volume published of the Memoirs of the Cambridge Analytical Society, founded by the above two authors 

 and Dean Peacock, to advocate ' the principles of pure d- ism as opposed to the doi-age of the university.' See Nos. 

 9214-15, supra. 



The above volume consists of an interesting preface (pp. i— xxii) ; on Continued Products (pp. 1-32) ; on Trigono- 

 metrical Series, with Notes (pp. 33-64) ; and on Equations of Differences, and their Application to the Determination of 

 Functions from given Conditions (pp. 65-114). The preface and the first two contributions were by Babbage ; the last 

 by Sir John Herschel. 



9246 Holograph Letter, signed, addressed to Franz Xaver Freiherr v. Zach 



(Astronomer), dated Dec. 23, 1824, closely ivritten on 4 pp. Ato. and illustrated ivith 2 diagrams, 

 £1. 5s 1824 



An interesting letter, referring to his catalogue of double stars, and the Brinkley-Pond controversy, giving a description 

 of Capt. Rater's ' collimator ', etc. 



9247 HERTZ (HeinriGh Rudolf, Univ. Bonn) Miscellaneous Papers, with Introduction by 

 Philipp Lenard ; Authorized Translation by D. E. JoNES and G. A. SCHOTT, ivith portrait, 

 folding plate, and 35 diagrams, 8vo. cl., 5s 6c? (p. 10s nett) 1896 



9248 Die Prinzipien der Mechanik [herausgegeben von Philipp Lenard], mit einem 



Vorworte von Hermann L. v. Helmholtz, 8vo. buckram, 8s (p. M. 12. sewn) Leipzig, 1894 



9249 The Principles of Mechanics, presented in a New Form, with Introduction by H. v. 



Helmholtz, translated by D. E. Jones and J. T. Walley, 8vo. cl., 6s Qd (p. 10s nett) 1899 



Based on Helmholtz's investigations, the above work discusses the various forms of energy, as well as the conditions 

 of transmission from one form to another. 



9250 Untersuchungen ueber die Ausbreitung der elektrischen Kraft; with 40 



diagrams, 8vo. hf. calf, uncut, t. e. g., 5s Leipzig, 1892 



9251 Electric Waves : Researches on the Propagation of Electric Action with Finite Velocity 



through Space : authorised English Translation by D. E. Jones, with Preface by Lord Kelvin, 

 AO illustrations, 8vo. cl., 6s (p. 10s nett) 1893 



Containing the author's investigations, by elaborating Clerk-Maxwell's theory, on the diffusion of electric forces 

 now known as ' Hertzian waves ', which plays such an important part in connexion with wireless telegraphy. 



9252 HERTZER (Heinrich) Mathematische Tabellen, Formeln und Constructionen zum 

 Gebrauch fiir Techniker ; with 10 pp. of diagrams, 8vo. hf. roan, 2s 6d Berlin, 1864 



9253 HERZ ("Walter, Univ. Breslau) IJber die Losungen, 8vo. sewn. Is Leipzig, 1903 



9254 HESSEL (Joharn Friedrich Christian) Die Anzahl der Parallelstellungen, und jene 

 der Coincidenzstellungen eines jeden denkbaren Raumdinges, u. s. w. ; with folding table, 

 8vo. (pp. 29), sewn. Is 6c? Cassel, 1853 



9255 HEUSINGER v. WALDEGG (Edmund) Handbuch fur Specielle Eisenbahn-Technik ; 

 Band III. Der Locomotivbau, 2. [neueste] vermehrte Auflage, bearbeitet von W. Basson, W. 

 BORK, A. V. Borries u. a. m. ; with Atlas, comprising 14 folding plates, 2 vols, large impl. 8vo. 

 hf. roan, 15s (p. M. 58) Leipzig, 1882 



Herr von Borries, with Mr. Wilson Worsdell and Mr. F. W. Webb of L. and N.W.R., was one of the pioneers of the 

 compound locomotive. 



9256 HETJSLER (Friedrich; Univ. Bonn) Die Terbene, roy. 8vo. sewn, 3s (p. M. 5) Braunschweig, 1896 



9257 HEVELIXJS {recte HEWELCKE] (Johann; f.r.s.) Selenographia : sive LUN^ De- 

 SCRiPTio ; atque accurata, tarn Macularum ejus, quam Motuum Diversorum, aliorumque omnium 

 Vicissitudinum, Phasiumque, Telescopii Ope deprehensarum, Delineatio; in qua simul cseter- 

 orum omnium Planetarum nativa Facies . . . addita est, Lentes Expoliendi Nova Katio, etc. etc. ; 

 with engraved title, beautiful portrait by J. Falck, and very numerous other fine copperplates, folio, 

 old Italian ivhite vellum extra {very slightly wormed, otherwise a FINE copy) ; rare, £2. 2s 



Gedani, 1647 



' The earliest great work on the geography of the moon and the aspects of the planets.'— Pro/. Simon Newcomb. 



It also contains his discovery of the libration of the moon in longitude, and is a work still in use. 



The first two chapters (pp. 1-31) contain a valuable account of the astronomical telescope and its manufacture. 



• With Hevelius selenography may be considered to originate. He was the first to construct a satisfactory lunar map ; 

 the principal formations on it he designated by names derived from their supposed terrestrial analogies, the whole number 

 so distinguished amounting to nearly 250. This map, though all the positions were laid down by estimation , is, con- 

 sidering the optical means at his disposal at this period, very accurate, and it remained for over 100 years the best map of 

 the surface of the moon.' — Nelson. 



9258 HEWITT (W., Surgeon) Essay on the Encroachments of the German Ocean along the 

 Norfolk Coast, with a Design to arrest its further Depredations, u-ith tivo lithographic views, 

 8vo. c^., 5s Norwich, 1844 



