9U HENKY SOTHEKAN v^ CO., 140, STRAND, W.(\, and 37, PICCADILLY, W. 



1777 HARDWICK (Thomas Frederick, pr.) Manual of Photographic Chemistry, inclutlint^ 

 the Collodion Process, oth Ed., illustrated^ fcap 8vo. (pp. 532), c/., 6s M 1859 



1778 Sixth Edition, enlarged, illustrated^ fcap. 8vo. (pp. 587), cl., 8s 6d 1861 



Of interest to the historian of chemistry for coutainiug a number of processes and recii)es lou» since forgotten. 



1779 HARDY (Lt. Robert William Hale, r.n., f.r.a.s.) Incidental Kemarks on some 

 Properties of Light, illustrated, 8vo. cL, 3s 1856 



1780 HARGREAVE (Charles James, q.c, f.r.s. ; Judge of Landed Estate Court, Ireland) Essay 

 on the Resolution of Algebraic Equations [with Preface by George Salmon, pr.. Provost of 

 T.C.D.], 8vo. d. {scarce), Is Qd privately printed, Dublin, 1866 



' The present essay, humanly speaking, may be regarded as the cause of his death.'— Dr. Salmon. ' In 1866 his attention 

 was again drawn to anew method of solving algebraic equations, and he began an essay on this question. Want of rest 

 brought on an exhaustion of the brain, from which he died at Bray on April 23rd '.— Z>. ^V. B. 



1781 HARKNESS (James; Brun Maur Coll., Pa.), and Frank MORLEY, Haverford Coll., Pa. : 

 Introduction to the Theory of Analytic Functions, 74 diagrams, large 8vo. cl. {scarce), 

 125 M 1898 



1782 Treatise on the Theory of Functions, 82 diagrams, large 8vo. cl. {scarce), \Ss 1893 



The best English text-book on the subject, including a glossary of technical terms, and now out of i)rint and scarce. 



1783 HARLEY (Timothy, f.r.a.s.) Lunar Science : Ancient and Modern, 8vo., cl., 2s 1886 



1784 Moon liORE, 8 woodcuts, 8vo. cl. gilt {out of print), 5s 1885 



1785 HARNACK (Axel) Die Elemente der Differential- und Integralrechnung; with 

 diagrams, 8vo. sewn, 5s (p. M. 7.) Leipzig, 1881 



1786 Introduction to the Study of the Elements of the Differential and Integral 



Calculus, trans, [and revised, with Notes and Index, by George L. Catucart], large 8vo. cl., 

 5sQd(x>.\0sQd) 1891 



1787 HARRINGTON (Thomas) Science Improved, or the Theory of the Universe, compre- 

 hending a Rational System of the most Useful as well as Entertaining Parts of Natural and 

 Experimental Philosophy, copperplates with movable slips, engraved vignettes, and maps, 4to. nice 

 copy in contemporary tree-calf extra, 10s Qd 1774 



See also Cowper (S.), aate. 



1788 HARRIS (John, d.d., f.r.s.) Astronomical Dialogues between a Gentleman and a Lady, 

 with Description of the ORRERY, 2nd Ed., by George Gordon, plates, 8vo. old calf {joints 

 weak), with Sheraton bookplate of Sir William trhy, of Boston, 6s Qd 1729 



The author was Rector of St. Mildred's, Bread St., City, and was severely persecuted by the Lecturer there, who held 

 him up to ridicule in ' The Picture of a High-Hying Clergyman ', 1716. He was also Boyle Lecturer. 



1789 Lexicon TechnicUxM: or Universal English Dictionary of Arts and Sciences, 



5th Ed., now digested into one Alphabet : with very considerable Additions and Improvements, 

 2 v., with Supplement, by a Society of Gentlemen, with portrait by G. White, plates, and numerous 

 woodcuts — 3 vols, folio, old calf gilt {fine copy), with bookplate of Philip 2nd Earl Stanhope, F.R.S. , 

 15s 1736-44 



Last and best edition of the first technological dictionary in any language. 



1790 HARRIS (John, ' Kuklos') The Circle and Straight Line: Supplementary Illus- 

 trations, plates, roy. 8vo. cl., 3s Qd Montreal, 1874 



A 'circle-squaring' problem. 



1791 The Laws of Force and Motion : a Revision of certain }»rominent Doctrines and 



Theories on Conventional Science, 4 plates and woodcuts, 4to. cl , 6s 6o? 1890 



Intended to show the fallacies of some well-known physical doctrines, e.g., Newton's theory of gravitation, and other 

 dynamical laws. The work is dedicated to ' the Creator of the Natural Universe.' 



1792 -; Lectures on Astronomical Theories : Celestial Sphere : Parallax and Aberration of 



Light : Theories of Light : Cometary Orbits, with numerous plates and woodcuts, roy. 8vo. cl., 

 8s 6c? Blontreal, 1876 



One of the scientitlc curiosities, the first treatise advocating a ' Doctrine of the Earth's Perpendicular Axis,' as oi)posed 

 to the inclined axis, and explaining the seasons from a wholly novel standpoint. 



1793 HARRIS (Joseph; Assay Master, Royal Mint) Description and Use of the Globes and 

 the Orrery, with brief Account of the Solar System, first edition, with folding plates, 8vo. fine 

 copy in contemporary panelled calf, with armorial bookplate of AdmL Earl Ferrers, F.R.S. 

 (1722-78), 10s 6d 1731 



1794 Third Edition, folding plates, 8vo. contemporary hf. calf gilt, with bookplate of Charles 



3rd Earl Stanhope, F.R.S., 6s ' 1734 



1795 Fourth Edition, /oWm<7 plates, 8vo. old calf, 5s 1738 



1796 Eighth Edition, folding plates, 8vo. old calf {binding damaged), 3s &d \1bl 



'On his monument in Talgarth Church it is said, that he invented many mathematical instruments.'— D.i^.B. 



1797 Treatise of Navigation, with another of Plain [s/e] Trigonometry, 12 folding plates, 



4to. fine copy in contemporary calf, with bookplate of Philip 2nd Earl Stanhope, F.R.S. ,\0s6d 1730 



This work describes some of the author's inventions, viz. a new Azimuth Compass, and a new Fore-Staff, as well as 

 improvements in the common Sea-Quadrant. 



1798 HARRIS (Sir William Snow, f.r.s.) On the Nature of Thunderstorms, and the Means of 

 Protecting Buildings and Shipping against Lightning, plates and woodcuts, 8vo. cl. {very 

 scarce), 15s 1843 



A full account of his invention of a lightning conductor for ships, and an answer to his critics. His system was adopted 

 in the Royal Navy in 1839, and rewarded with an annuity of £300. by the Government, and later with a knighthood and a 

 grant of .i;6000— an unusual example of official gratitude. 



1799 Rudimentary Magnetism, Parts I and II, first edition, illustrated, fcap. Svo. cl., 



2s Qd 1850 



1800 Treatise on Friction al Electricity, in Theory and Practice, ed., with Memoir, by 



Tharles Tomlinson, f.r.s., with numerous luoodcuts, Svo. cl. {scarce), \Qs Qd 1867 



The editor's own copy, with his auto, on flyleaf. 



