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

 5223 WARING (Edward, m.d., f.r.s. ; Lncasian Prof. Math., Cantab.) On Centripetal Forces, 

 with plate, 4to. (pp. 36), sewn, 2s 6d 1788 



5224 On INFINITE Series, plate, 4to. (pp. 27), setvn, 2s 1791 



5225 Meditationes Algebraic^, Editio III. [et ultima], recensita et aucta: Miscellanea 



Analytica, de yEquationibus Algebraicis, et Curvaruni Proprietatibus ; with 3 plates— 2 vols. 

 4to. in 1, calf gilt, with arms on back and sides, £1. Is Cantabrigice, 1782-62 



The Meditationes, termed by Lagrange 'un ouvrage rerapii d'excellentes recherches ', contains numerous important 

 investigations on the theory of equations, and enlarges the results contained in the Miscellanea. In it also was first 

 published Wilson's theoiem on the theory of numbers. 



' In den Miscellanea Analytica, 1762, -werden die drei ersten Glieder der allgemeinen transformierten Gleichung ohne 

 Ableitung angegeben. Dieses beriihmte Verfahren hat spiiter Lagrange unabhiingig ausgearbeitet. In seincn nach- 

 folgenden Werken hat er Warings Prioritat angezeigt '.—Pro/. Moritz Cantor. 



Bound up at end is, 'A Vindication of the Miscellanea Analytica, in Answer to a late Pamphlet entitled Observa- 

 tions, etc' [by Sir John Wilson, f.r.s.], Svo. (pp. 22), Cambridge, 1760. 



5226 Meditationes Analytics, Editio II., cum nonnullis Additionibus ; with plate, 4to. 



(pp. 771), old calf {joints cracked), with bookplate of Henry Bickersteth, Lord Langdale, Master of 

 the Rolls, \0s ibidem, 1785 



A copious account of this important work will be found in Prof. Moritz Cantor's Vorlesunqen iiber Geschichte der 

 Mathemxitik, vol. I\^ pp. 275-0. 



5227 On the Method of Correspondent Values, etc., 4to. (pp. 19), seven, 2s 1789 



5228 Proprietates Algebraicarum Curvarum ; with 1 plates, 4to. sewn, 5s Cantabrigio', 1772 



5229 Another Copy, old calf with Lord Langdale's bookplate and MS. additions, 7s 6d 



' Ein geistreiches, vielseitiges Werk, durchaus original gedacht, und jedenfalls eine der bedeutendsten Erscheinungen 

 der ganzen Epoche auf diesem Gebiet.' — Prof. Cantor. 



5230 On the Resolution of Attractive Powers, plate, 4to. (pp. 14), sewn, 2s 1789 



• Undoubtedly one of the ablest analysts that England has produced.'— i)i(g'aZ(/ Stewart. 



5231 WARING (George Edwin) Draining for Profit, and Draining for Health, illustrated, 

 post 8vo. hf calf 2s New York [1867] 



5232 The Sanitary Drainage of Houses and Towns, illustrated, post Svo. hf calf, 3s 



(p. lOs 6d) ib., 1876 



5233 WARREN (Henry White, d.d.) Recreations in Astronomy, with Directions for Practical 

 Experiments and Telescopic Work, 83 illustrations and star-maps, post 8vo. hf morocco neat {out 

 of print), 5s New York [1879] 



5234 WARREN (John, pr.; F.R.S.) Treatise on the Geometrical Representation of the 

 Square Roots of Negative Quantities, with diagrams, 8vo. boards, uncut, 6s Cambridge, 1828 



'Representing every kind of quantity geometrically by the intervention of symbolical expressions, which involve the 

 square roots of negative quantities, and designate lines in position as well as magnitude. The work bears evident marks 

 of originality, and has received honourable mention from ccmtinental as well as Irom English mathematicians '.—D. N. B. 



5235 WATCHMAKER (The), Jeweller, and Silversmith, Vols. 3, 5, 7, 9 and 10, with plates 

 and numerous woodcuts, 5 vols. 4to. in 4, cl., lOs 1877-85 



5236 WATKINS (Francis ; opticien) L'Exercise [sic] du Microscope : un Abrege de tout ce qui a ete 

 ^crit par les meilleurs Autheurs, avec les Precautions qu'on doit prendre pour faire les Observations 

 avec Succes, et Description d'un Microscope, qu'on pent appeller Universel, construit sur un 

 nouveau Plan; with large copperplate, 12mo. old sheep {Joints cracked), 6s 



Londres, chez Vauteur, 1754 



5237 WATSON (Henry William ; ^., f.r.s.) The Elements of Plane and Solid Geometry, 

 diagrams, 12mo. cl., \s 6d 1871, or '2 



5238 Treatise on the Kinetic Theory of Gases, 8vo. cl., \s 6d Clarendon Press, Oxford^ 1876 



5239 Second [last] Edition, post 8vo. cl., 2s 6d (p. 4* 6d) a. e., ib., 1893 



6240 , and Samuel Hawksley BURBURY; f.r.s.: The Mathematical Theory of 



Electricity and Magnetism, ivith diagrams, 2 vols. 8vo. cl., 6s 6d (p. £1. \s) a. e , ib., 1885-9 



6241 Vol. II only : Magnetism and Electrodynamics, diaarams, 8vo. cl., 35(p. IO5 6d) 1889 



5242 , and Edward John ROUTH, f.r.s. : Cambridge ^Senate-House Problems and 



Riders for 1860, with Solutions, Updates, post Svo. cl. {out of print), 3* 6d (p. 7^ 6d) Cambridge, 1860 



5243 WATSON (Richard ; absentee Bp. of Llandaff ; F.R.S.) Chemical Essays (Vols. 1-3, .3rd Ed., 

 and 4-5, first edition, 5 vols. 12mo. boards, uncut (rare), £1. 6s lIM-l— Cambridge, 1786 



5244 Sixth Edition, 5 vols. 12mo. mottled calf gilt, \6s 6d 1793-6 



' The most notable essays are (1) ' On the Degrees of Heat at which Water boils ', describing an experiment on the boiling 

 of water, in a closed flask nearly free from air, which has become classical ; (2) ' On Pit-coal ' (1 781), suggesting the condensing 

 of the volatile products from coke-ovens, an operation which has recently become of great industrial importance ; (3) ' On 

 the Smelting of Lead Ore' (17S1), suggesting the condensation of lead fume, and of the sulphurous acid produced in the 

 roasting of sulphide ores ; (4) ' On Zinc' (1786).'— Z>. ^V. B. 



The ' Chemical Essays ' also include the author's contributions to the ' Philosophical Transactions ', and the Transac- 

 tions of the Manchester Literary and Philosophical Society, comprising his discovery of the black -bulb thermometer, and 

 his ingenious ' Experiments and Obseri'ations on various Phamomena attending tlie Solutions of Salts '. 



5245 Institutionum Chemicarum in Prajlectionibus Academicis explicatarum, Pars Met- 



ALLURGICA, Svo. (pp. 66), scion. Is 6d Cantabrigio;, 1768 



'The gift of the author '.—Irtscr. on rev. of title. This work formed the textbook for part of the author's course in 

 chemistry on his appointment as professor of chemistry at Cambridge University, and was designed as 'a contribution to 

 the work of giving ' a scientific form ' to chemistry.'— D. N. B. His success in chemistry was at first a remarkable tour de 

 force, as on his appointment to the chair his acquaintance with the science was absolutely nil, and he spent fourteen 

 months straight away in reading it up and in experimenting with an operator from Paris. He then quickly became a 

 skilled original investigator, as shown above. 



5246 Another Copy, with Essay on the Subjects of Chemistry, and their General Di\ision : 



and Plan of a Course of Chemical Lectures— 3 vols. Svo. in 1, old calf {very scarce), 15s 



ibidem, 1768-71-71 

 Bishop Watson was probably the champion absentee even of the age he lived in. He was Bi.shop of Llandaff for thiity- 

 four years and never once resided within the dioce.se, but lived in a house of his own at the Lakes. 



