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



10724 LEONABDO Pisano [BONACCI .^/ve FIBONACCI ; /orwaY a.d. 1200] Scritti (II Ltber 

 Abbaci, e La Practica GEOMEXRliE), publicatidaBALDASSARRE BONCOMPAGNI ; vnth numerous 

 diagrams, 2 vols, folio, sewn, 'uncut, £2. 25 Roma, 1857-62 



10725 II Ltber Abbaci, publicato secondo la Lezione del Codice Magliabechiano C. I, 2616, 



Badia Fioientina, no. 73, da Baldassarre Boncompagni ; with numerous diagrams, folio, sewuy 

 icith inscr. to the Duca Massimo, £1. Is ibidem, 1857 



' He exjilains in his Liber Ablaci the Arabic system of numeration, and remarks on its gre^.t advantages over the Roman ; 

 gives an account of alj,ebra, and points out the convenience of geometry to get rigid demonstrations of algebraical 

 formulae. He shews how to solve simple equations, solves a few quadratic equations, and states some methods for the 

 solution of indeterminate equations . . . The Liber Abbaci is especially interesting in the history of arithmetic, since 

 practically it introduced the use of Arabic numerals into Christian Europe.'— W. W. R. Ball. 



10726 , Tre Scritti Inediti di, pubblicati da Baldassarre Boncompagni ; with folding 



plate, 8vo. sevn, with editor's inscr. and MS. CORRECTIONS AND ADDITIONS, 7s 6c? Firevze, 1854 

 The questions propout,ded to Leonard of Pisa by the celebrated Emperor Frederick the Second on his passage through 

 Pisa in 1225, which resulted in the production of three of Leonard's most remarkable works. The volume, here first 

 printed by M. Boncompagni, contains 'Super Solutionibus quarundem Qucstionum ad Numerum et ad Geometriam 

 vel ad utrumque pertinentium, Liber Quadratorum.' 



10727 L EOT AXTD (Vincent, s.j.) Cyclomathia, sen Multiplex Circuli Contemplatio, III 

 Libiis comprehensa. I. Quadiatur.ie Examen confirmatur ac promovetur. II. Anguli Con- 

 tingentije Natiira exponitur. III. Quadracitis Facultates Iiiaudita3 proferuntur ; with engraved 

 arms on title, and numerous diagrams, 4to. contemporary Italian vellum {somewhat browned as 

 usual and title stamped, otherivise a fine copy), 18s Qd Lugduni, 1663 



A defence of the views of Clavius on contiguous angles. It was answered by Wallis. 



' Oet ecrit est suivi d'un traite sur la quadratice de Dinostrate, oii I'auteur developpe quelques proprietes non encore 

 aperQiips de cette courbe.' — Biogr. Gen. 



10728 [LEREBOUBS (Noel Marie Paymal, opticien)] Traite de Galvanoplastie, par J. li. ; 



ivith 11 illustrations, roy. 8vo. sewn (scarce), 7s Gd 184.3 



One of the earliest practical treatises on electrotyping, published only a few years after its invention by Jacobi (v. Ko. 



9709 ante. 



At end is a 16 p. Catalogue of Photographic Apparatus, Microscopes, etc. made by the author. 



10729 Treatise on Photography ; containing the latest Discoveries and Improvements 



appertaining to the Daguerreotype, translated by J. Egerton, with folding plate, cr. 8vo. cl. 

 (scarce), 12s i5d 1843 



Containing chapters on 'Photogenic Papers on the Calotype,' by H. Fox Talbot, f.r.s., ' On a Voltaic Process for 

 Etching Daguerreotype plates', by Sir W. R. Grove, f.r.s., etc. etc. 



10730 LEROY (Charles rran9ois Antoine) Analyse Appliquee a la Geometrie des Trois 

 Dimensions, S^ Edition ; w-ith 5 foldina plates, 8vo. hf. calf (binding rubbed), with auto, and 

 bookplate of Sir H. W. Elphinstone, 3s Qd 1843 



10731 Traite de Geometrie Descriptive, suivi de la M^thode des Plans cotes et de la 



Theoiie des Engrenages cylindiiques et coniques; 3*^ Edition augmentee ; with 1\ plates, 2 vols. 

 4to. hf. calf (backs damaged). As ^d 1850 



10732 LE SAGE (Pierre Charles) Recueil de divers Memoires ext^aits de la Bibliotheque 

 Imperials des Ponts et Chaussees, a I'Usage des Ingenieurs; 2- Edition, augmentee de cinq 

 Nouveaux Memoires Inedits ; with fine portrait of the author, and of J. B. Perronet after Cochin 

 fils^ and ^6 copperplates (many folding), 2 vols, large 4to. russia extra, g. e. (backs slightly rubbed^ 

 otherwise a fine copy), £1. Is 1810 



The first volnme contains interesting memoirs on civil engineering in England, including views of houses in Piccadilly 

 and Oxford Street, and the second a translation of Smeaton's account of the Eddystnne Lighthouse, with 4 plates 

 reengiaved. There is also a fine folding view of the Place and Pontde la Concorde, Paris, after Desprez. 



10733 LESCALLIEB. (Daniel Baron) Traite Pratique du Greement des Vaisseaux et autre.^ 

 BcUimens de Mer ; with 34 fine copperplates (mostly folding), 2 vols. 4to. old calf (rare)y 17s Qd 



1791 



10734 Another Copy, 2 vols, in 1, old English calf (nice copy), 18s 6c? 



An interesting treatise not only on rigging ships, bnt on French naval architecture at a time when it excelled in some 

 respects (and often unwillingly enriched 1) even that of England. 



10735 Vocabulaire des Termes de Marine Anglois et Francois, avec une Explication des 



Figures qui y sont contenues, et des Definitions de quelques Termes de Marine, principalement 

 ceux de Greement ; with 31 fine copperplates and 2 vignettes on copper, Ato. fine copy in contemporary 

 French calf extra, 15s Imprimerie Eoyale, 1777 



10736 LE SEXJR \sive LE SUEUR] (Thomas, Ord. Min.; commentator on Newton) Memoire 

 sur le Calcul Integral, 12mo. (pp. 52), sewn, 5s 6c? Rome, 1748 



' Renfermant des recherches sur la resolution generale des equations. L'auteur fait voir que si I'on clierche a 

 decomposer enfacteurs le premier nombred'une equation d'un degre superieur au quatrieme, on estamenc a des equations 

 dont le degre est au moins egal.' — Bioqr. Ghi. 



10737 , Francesco JACOTIER, Ord. Min., e Ruggiero Giuseppe BOSCOVICH, s.j. : 



RlFLESSiONi sopra alcuneDiFFlcOLTA spettanti i Danni, e Kisarcimenti della Cupola di S. Pietro ; 

 with vignette on copper, 4to. (pp. 64), sewn, 6s Qd {ibidem'], 1743 



10738 LESOW (William) 'Mathematical P>ook' (treating of Navigation, Trigonometry, and 

 Dialling), a neatly written MS. on about 300 pp., ivith numerous very prettily executed 

 diagrams, folio, vellum (back damaged), £3. 3s 1713-14 



Containing Trigonometry, Plane and Spherical, ' Sailing, Plain, OblicV, in Currents, etc. etc., Mercators Sailing, 

 Finding y<! Latitude, Doctrine and Projection of the Sphere, Astronomicall Problems, and the Art of Dialling.' 



10739 L'ESPINASSE (Charles, f.r.s.) Description of an Improved Apparatus for performing 

 Electrical Experiments, in which the Electrical Power is increased, the Operator intirely 

 secured from receiving any accidental Shocks, and the whole rendered more convenient for 

 Experiments than heretofore, with copperplate illustrating the new electrical machine, 8vo. (pp. 3), 

 unbound, os 1769 



