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



15496 WECKER (Johann Jakob, m.d., Basel) De Secretis Libri XVII, ex variis Authoribus 

 collecti, methodiceque digesti, et aucti ; accessit Index locupletissimus ; with woodcuts, 12mo. old 

 vellum (rare), 10s 6d Basilece, 1662 



The ' Secrets ' which are collected from about 150 different authors, include secrets of metals, glass, jewels, and 

 how to counterfeit them, hail, rain, snow, thunder, lightning, hurricanes, etc., natural magic, mathematics, music, and 

 astrology, etc. etc. etc. 



' A very curious work, much sought after on account of the singular doctrines and secrets of every science contained 

 therein '. — Libri Catalogue. 



15497 WEDEL (Georg Wolfgang; m.d., Univ. Jena) Introductio in Alchimiam, sm. 4to. 

 (pp. 60), hf. calf (large copy) ; rare, 12s 6d lence, 1706 



The author is not noticed by Mr. A. E. Waite. He was thought to have discovered the mystic metal as 

 Ka-<ri-T£-pog l^sic]. 



15498 WEDGWOOD (Thomas, son of Josiah Wedgwood ; protophotographer) Experiments and 

 Observations on the Production of Light from different Bodiesj by Heat and by Attrition ; 

 with the Continuation, with plate, 2 papers 4to. (pp. 20 + 13), sewn, 8s %d ' 1791-2 



' Wedgwood's only writings, in which we find the earliest suggestion of the general law, since established, that all 

 bodies become red hot at the same temperature. They are remarkable as indicating a considerable power of research when 

 he was only 20 years of age.'— X). N. B. 



15499 WEIDLER (Johann Friedrich, Univ. Wittenberg, F.R.S.) Institutiones Matheseos, 

 selectis Observationibus illustratse, Editio nova ; with 52 plates, thick 12nio. old vellum, with auto, 

 of John Lee, of Hartwell, Q.C., F.R.S. , also of * J. Fiott \Iiis original name] Stockholm ', 6s 6d 



Vitemhergce, 1736 

 Including also Physics, Astronomy, Dialling, and Civil and Military Architecture. 



15500 WEISBACH (JuUus) Abriss der Markscheidekunst, nach Vortragen herausg. von Oscar 

 Choulant ; ivith 'd folding plates, 8vo. cl., 3s (p. M. 8) Freiberg, 1873 



15501 Manual of the Mechanics of Engineering, and of the Construction of Machines, 



V^OL. II : Hydraulics and Hydraulic Motors, translated from the 4th German Edition by 

 A. Jay Dv Bois, with 380 woodcuts, large 8vo. cl., with auto, of F. J. Jervis-Smith, pr., F.R.S., 

 7s 6f^ (p. £1. 5s) ' New York, 1882 



15502 , and Gustav HERMANN: The Mechanics of Hoisting Machinery, including 



Accumulators, Excavators, and Pile-Drivers : Authorised Translation from the 2nd German 

 Edition, by Karl P. Daiilstrom, with 177 illustrations, 8vo. cl.. Is (p. 12s Qd nett) 1893 



15503 The Mechanics of Pumping Machinery: Authorised Translation from the 2nd 



German Edition, by Karl P. Dahlstrom, with 197 illustrations, 8vo. cl.. Is (p. 12s &d nett) 1897 



15504 WELLS (Edward, Rector of Cotesbach, Leicestershire) The Young Gentleman's Course of 

 MATHEMATiCKS(Arithmetick and Geometry; Trigonometry, Mechanicks, and Opticks; Astronomy, 

 Chronology, and Dialling), with numerous folding plates, 3 vols. 8vo. old calf, 12s Qd 1723-31-25 



A very genteel work. 



WELLS (Herbert George, novelist) The Discovery of the Future— y. Rayleigh, No. 

 13948 ante. 



15505 WENZEL (Carl Friedrich) Chymische Untersuchungen des Flussspaths, 12mo. sewn, 

 3s Qd Dresden, 1783 



15506 Lehre von der Verwandschaft der Korper, thick sm. 8vo. sewn {rare), 10s Qd ib., 1782 



' Das Werk euthalt die GrundzUge der stochiometrischen Lehren, so weit sie bis zura Anfange unsores Jahrhunderts 



erforscht wurden. Wenzel hatte den Weg gebahnt, die Zusammensetzung aller NeutraLsalze aus der Analyse weniger 

 vorauszu besti m ni en . ' —Hernui n ?i, Kox>p. 



15507 WERNEBURG (Johann Friedrich Christian; Univ. Jena) Die richtige Katoptrik 

 [mit Gegenbemerkungen von L. D. v. MUNCHOW] ; with 2 folding plates, 4to. (pp. 64), sewn, 

 3s 6d ' o. a, 1825 



Attempting a new theory of sight. 



15508 WERNER (Abraham Gottlob, Bergakademie Freiberg) Nouvelle Theorie de la For- 

 mation des FiLons : Application de cette Theorie a I'Exploitation des Mines, particulierementde 

 celles de Freiberg, traduite [par J. F. Daubuisson] et augmentee d'un grand Nombre de Notes, 

 dont plnsieurs out 6te fournies par I'Auteur meme ; with fine portrait, post 8vo. sewn, uncut 

 (VERY rare), £1. 10s Freiberg, 1802 



One of the author's most important geological works. 'To him belongs the great merit of having brought into 

 prominence a definite principle in the construction of the earth's crust, and a precise method of geological investigation. 

 . . . With the publication of Werner's views on this subject a great controversy began, which was carried on with 

 acrimony that is now hard to realise. Those who upheld the igneous origin of such rocks as basalt were styled Vulcanists, 

 while those who followed Werner became known as Neptunists.'— Pro/. James Geikie, F.R.S. 



A very copious account of the work will be found in Hunt's ' British Mining,' pp. 331-4. 



15.509 : [Freisleben (Johann Carl)] Abraham Gottlob Werner's letztes Mineral- 

 System, aus dessen Nachlasse auf oberbergamtliche Anordnung herausgegeben und mit Erlauter- 

 ungen versehen, 8vo. sewn (rare), 10s 6d ibidem und Wien, 1817 



15510 : Wernerian Natural History Society's Memoirs, Vols. I— IV and VI, with 



numerous plates and maps {mostly coloured) , 5 vols. 8vo. new hf. calf gilt {title of v. Istam,ped); very 

 scarce, £1. 10s ■ Edin., 1811-32 



This publication was founded by Robert Jameson, f.r.s., to expound the views of Neptunists, and contains numerous 

 contributions by him, besides others by Sir David Brewster, Robert Brown, Sir Alexander Mackenzie, William Scoresby, 

 Jr., F.R.S., Robert Stevenson, c.E., Thomas Thomson, m.d., f.r.s., etc. etc. 



It is important in connexion with the history of the Werner-Hutton controversy. 



15511 WEST (John, Rector of St. Thomas in the East, Jamaica) Mathematical Treatises: 

 I. Theory of Analytical Functions. II. Spherical Trigonometry, with Practical and 

 Nautical Astronomy; edited from the Author's MSS. by Sir John Leslie, with Memoir by 

 Edward Sang, f.r.s. e., printed on ribbed paper, with 2 plates, and diagrams, thick 8vo. cl. 

 {scarce), 10s M Edin., 1838 



