90 HENRY SOTHERAN & CO., 140, STRAND, W.C., AND 37, PICCADILLY, W. 



1777 HARDWICK (Thomas Frederick, pr.) MANUAL of PHOTOGRAPHIC CHEMISTRY, including 



the COLLODION PROCESS, 5th Ed., illustrated, fcap 8vo. (pp. 532), cl., 6s Qd 1859 



1773 SIXTH EDITION, enlarged, illustrated, fcap. Svo. (pp. 587), cl., 8s Qd 1861 



Of interest to the historian of chemistry for containing a number of processes and recipes long since forgotten. 



1779 HARDY (Lt. Robert William Hale, R.N., F.R.A.S.) INCIDENTAL REMARKS on some 

 PROPERTIES of LIGHT, illustrated, Svo. 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.], Svo. cl. (scarce), 7s Qd privately printed, Dublin, 1866 



1 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 '. D. N. B. 



1781 HARKNESS (James; Brim Mawr Coll., Pa.), and Frank MORLEY, Haverford Coll., Pa. : 

 INTRODUCTION to the THEORY of ANALYTIC FUNCTIONS, 74 diagrams, large 8vo. cl. (scarce), 

 12s Qd 1898 



1782 TREATISE on the THEORY of FUNCTIONS, 82 diagrams, large Svo. cl. (scarce], ISs 1893 



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



1783 HARLEY (Timothy, F.R.A.S.) LUNAR SCIENCE : Ancient and Modern, 8vo., cl, 2s 1886 



1784 MOON LORE, 8 woodcuts, 8vo. cl. gilt (out of print), 5s 1885 



1785 HARNACK (Axel) Die ELEMENTS der DIFFERENTIAL- und INTEGRALRECHNUNG ; with 

 diagrams, Svo. 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. CATHCART], large Svo. cl., 

 5s Qd (p. 10* Qd) 1S91 



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.), ante. 



1783 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, Svo. old calf (joints 



weak), with Sheraton bookplate of Sir William trby, of Boston, 5s 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 Hi^h-flying Clergyman ', 1716. He was also Boyle Lecturer. 



1789 LEXICON TECHNICUM: 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., 

 155 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. Svo. cl., 3s Qd Montreal, 1874 



A ' circle-squaring ' problem. 



1791 The LAWS of FORCE and MOTION : a REVISION of certain prominent Doctrines and 



Theories on CONVENTIONAL SCIENCE, 4 plates and woodcuts, 4to. cl , Qs Qd 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. Svo. cl., 

 8s Qd Montreal, 1876 



One of the scientific curiosities, the first treatise advocating a ' Doctrine of the Earth's Perpendicular Axis,' as opposed 

 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, Svo. fine 

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

 (1722-78), 105 Qd 1731 



1794 TH[RD EDITION, folding plates, Svo. contemporary hf. calf gilt, with bookplate of Charles 



3rd Earl Stanhope, F.R.S., Qs " 1734 



1795 FOURTH EDITION, folding plates, Svo. old calf, 5s 1738 



1796 EIGHTH EDITION, folding plates, Svo. old calf (binding damaged), 3s Qd 1757 



1 On his monument in Ta I garth Church it is said, that he invented many mathematical instruments.' D.N.B. 



1797 TREATISE of NAVIGATION, with another of PLAIN [sic] TRIGONOMETRY, 12 folding plates, 



4to. fine copy in contemporary calf, with bookplate of Philip 2nd Earl Stanhope, F.R.S., lOsQd 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 u-oodcuts, Svo. cl. (very 

 scarce), 15s 1843 



A full accownt 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 5000 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 



CHARLES TOMLINSON, F.R.S., with numerous woodcuts, 8vo. cl. (scarce), 10s Qd 1867 



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



