HENRY SOTHERAN & CO., 140, STRAND, W.C., AND 37, PICCADILLY, W. 12? 



2532 LEIBNIZ (Gottfried Wilhelm Freiherr v.) : Virorum Celeberr. G. G. LEIBNITII et JOH. 

 BERNOULLI: COMMERCIUM PHILOSOPHICUM et MATHEMATICUM, 1694-1716; with fine portrait of 

 Leibniz by Ficquet, and numerous plates, 2 vols. 4to. in 1, old calf gilt, 17s Qd Lausannce, 1745 



Important for containing the correspondence between Leibniz and Jean Bernoulli on the question of the priority of the 

 invention of the differential calculus between Leibniz and Newton. See NEWTONIANA, post, for Commercium Epistolicum, 

 giving conclusions in Newton's favour. 



2533 LEIFCHILD (John R. ) On COAL at HOME and ABROAD, with relation to Consumption, Cost, 

 Demand, and Supply, etc. etc., with Appendix, 8vo. cl., 2s (p. 4s Qd) 1873 



2531 LEISS (C.) Die OPTISCHEN iNSTRUMENTEder FIRMA R. FUESS : deren Beschreibung, Justierung 

 und Amvendung ; with 3 plates and 233 ivoodcuts, 8vo. sewn, Qs (p. M. 11.) Leipzig, 1899 



2535 LEITCH (William, Principal, Univ. Queen's Coll., Canada) GOD'S GLORY in the HEAVENS, 

 2nd Ed., with 12 plates, and woodcuts, post 8vo. cl., 2s 1863 



2536 LEITH HARBOUR, CORRESPONDENCE and REPORTS relative to the IMPROVEMENT of, 2 plans 

 (1 coloured), 4to. sewn, 3s Qd Leith[l822] 



2537 LEITHHEAD (William) ELECTRICITY: its Nature, Operation, and Importance in the 

 Phenomena of the Universe, 51 illustrations, fcap. 8vo. cl. (somewhat stained), 2s 1837 



Dedicated to Faraday. 



2538 LEJEUNE-DIRICHLET (Peter Gustav ; Gottingeri) VORLESUNGEN liber ZAHLENTHEORIE, 

 herausgegeben v. R. DEDEKIND, 8vo. hf. calf gilt, 45 Braunschweig, 1863 



' Of his original researches the most celebrated are that on the establishment of Fourier's Theorem, and that in the theory 

 of numbers on asymptotic laws, i.e. laws which approximate more closely to accuracy as the numbers concerned become 

 larger.' W. W. R. Ball. 



2539 LEMERY (Nicolas) COURS de CHIMIE : la Manure de faire les Operations qui sont en usage 

 dans la Me"decine, par une Me"thode facile ; nouvelle Ed., augmentee par [THEODORE] BARON ; with 

 plates, thick 4to. fine copy in old calf gilt (joints cracked), with ARMS OF KING GEORGE III. in gold 

 on sides, 155 1756 



' La meilleure edition est celle donnee par Baron en 1756.' Biogr. Gen. ' Ce livre a fait autorite en chimie pendant plus 

 de 100 ans. II a etc le guide, le code, le manuel oblige des chimistes du XVIIIe siecle, et meine apres le renouvellement de 

 la science on chercha longtemps encore dans le livre de Lemery des precedes, des details pratiques que Ton ne trouvait 

 }>oint alors '. Cap. , 



2540 LEMOINE (Georges) ETUDES sur les EQUILIBRES CHIMIQUES : with woodcuts, 8vo. sewn, with 

 inscr. to Prof. A. W. Williamson, F.E.S., 3s Qd(p. F.9.) 1881 



2541 LE MONNIER (Pierre Charles; F.R.S.) HISTOIRE CELESTE, ou Recueil de toutes les Observ- 

 ations Astronomiques faites par Ordre du Roy ; avec Discours sur le Progres de 1' Astronomic 

 depuis la fondation de 1'Observatoire Royal ; with 7 plates, 4to. old mottled calf (fine copy), with 

 bookplate of Philip 2nd Earl Stanhope, F.R.S., Is Qd 1741 



2512 [ ] INSTITUTIONS ASTRONOMIQUES, avec Essai sur 1'Histoire de F Astronomic Moderne ; with 



plates, 4to. boards, uncut, with Lord Stanhope's bookplate, 5s 1746 



' C'est un des meilleurs ouvrages qu'on ait fait en frangais sur I'astrouomie clementaire.' Lalandc. 



2543 - La THEORIE des,CoMETES, avec TABLES pour calculer les Mouvements des Cometes, du 

 Soleil, et des principales Etoiles fixes ; with plates, 8vo. old calf gilt (FINE TALL COPY), with Lord 

 Stanhope's bookplate, 8* Qd 1743 



2544 ANOTHER COPY, old calf gilt, Is 



A translation of Halley's Synopsis, with additions by Le Monnier. 



2545 LENORMAND ,(L. S.), JANVIER, et D. MAGNIER: NOUVEAU MANUEL COMPLET de 

 1'HoRLOGER, nouv. Ed. refondue ; with folding plates, 2 vols. 12mo. in 1, cl., 35 1876 



2546 LENS (Arnoldus de, medicus ac mathematical) In GEOMETRICA ELEMENTA EISAQOGE ; with 

 printer's device on title, woodcuts, and diagrams, 16mo. old parchment, 6s 



Antverpiw, Christ. Plantinus y 1565 

 Unknown to Poggendorff. 



2517 LEONI (Antonio Camillo, sac. Piacentino), Lo SQUADRO di : Trattato breve per havere Dis- 

 tance de' Siti, dari il suo a Pretendenti legitimi nelle Alluvioni de' Fiumi, repararsi dalle Corrosion! 

 Fluviali, e misurare un' Acqua Corrente ; with front., and plates, cr. 4to. boards, uncut, 105 



Parma, 1699 



2548 LEOTATJD (Vincent, s.j.) EXAMEN CIRCULI QUADRATURE hactenus editarum CELEBERRIM/K, 

 qnain . . . GREGORius S. VINCENTIO, s.J., exposuit, necnon CURVILINEORUM CONTEMPLATIO : 

 olim inita ab ARTUSIO DE LlONNE, Vapincensi Episc. ; with fine portrait of Hugues de Lionnc, 

 Marquis de Berni, by Nantueil, vignettes and numerous diagrams, 2 vols. cr. 4to. in 1, old calf gilt 

 (fine copy) ; RARE, with bookplate 'of Philip 2nd Earl Stanhope, F.R.S. , 1. 55 Lugduni, 1654 



V. II is a refutation of the alleged discovery of the squaring of the circle by Gregoire de St -Vincent. V. I contains an 

 original treatise by BP. A. DE LIONNE, his only work extant. ' II est le premier qui ait remarque la quadratilite absolue 

 des deux portions de la lunule d'Hippocrate.' Biogr. Gen. 



2549 LEROY (Charles Fra^ois Antoine) ANALYSE APPLIQUEE a la GEOMETRIE des TROIS 

 DIMENSIONS ; ivith 5 plates, 8vo. boards, 3s 1829 



2550 - SECONDE EDITION, augmentee ; 5 plates, Svo. hf. calf (rubbed), 3s Qd 1835 

 2:>51 - - AUTRE (2 e ) EDITION, augmentee; 5 plates, Svo. hf. calf, 3s Qd Liege, 1839 



TRAITE de GEOMETRIE DESCRIPTIVE ; with 60 plates, 2 vols. 4to. hf. calf, 45 1834 



2553 - TRAITE de STEREOTOMIE, 4to., with Atlas, containing 74 plates, roy. folio 2 vols. hf. 

 calf, Is Qd 1844 



2554 LESAGE (George Louis) : CHARCOT (Anthelmus, Lugdunceus) LEX NATURAE UNICA, sen de 

 Attractione ad Impulsionem revocata ; Theses Philosophicoe, 4to. sewn, with numerous MS. 

 notes by G-. L. Lesage (see below), 2. 2s Lugduni, 1770 



This attack on Lesage's famous theory explaining the phenomenon of gravitation is important as having belonged to 

 Lesage himself, who has added a large number of MS. notes in confutation of certain passages, and thereby enlarged his 

 own views on the subject. The thesis itself was written according to Lesage's MS. notes on title by PIERRE 

 (1719-1809), a well-known physicist, against whom the notes are directed. 



