HENRY SOTHERAN & CO., 140, STRAND, W.C, aKd 37, PICCADILLV, W. 1-21 

 L'.332 LEIBNIZ (Gottfried Wilhelm Freiherr v.) : Virorum Celebeir. G. G. Leibnitii et JOH. 

 liEKNOULLii COMMERCIUM Philosophicum et Mathematicum, 1694-1716; ivith Jine portrait of 

 Leibniz by Ficquet, and numerous plates, 2 vols. 4to. in 1, old calf gilt. Us Qd Lausannw, 1745 



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

 invention of the differential calculus between Leibniz and Newton. See Newtoniana, post, for Coinmercium Eptstolicumi 

 givinji conclusions in Newton's favour. . 



2383 LEIFCHILD (John R.) On Coal at Home and Abroad, with relation to Consumption, Cost, 



Demand, and Supply, etc. etc., witli Appendix, 8vo. cl., 2s (p. 4* 6d) 1873 



2.531 LEISS (C.) Die optischen iNSTRUMENTEder Fjrma R. Fuess : deren Beschreibun^, Justierung 



und Ainvendunj,' ; with 3 plates and 233 woodcuts, 8vo. seicn, 6s (p. M. 11.) Leipzig, 1899 



L'').35 LEITCH (William, Principal, Univ. Queen's Coll., Catiada) God's GLORY in the Heavens, 



2nd Ed., with 12 plates, and woodcuts, post 8vo. cl., 2s 1862^ 



•J.')36 LEITH HARBOUR, CORRESPONDENCE and REPORTS relative to the Improvement of, 2 plans 



(1 coloured), 4 to. sewn, 3s 6d Leith [1822] 



2"):>7 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; G'c/m'n^rcn) VORLESUNQEN uber Zahlentheorie, 

 heraus«,'eo;eben v. R. Dedekind, 8vo. A/, calf gilt, is Braunschweig, 1863 



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

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 larger.'— ;r. W. R. litiU. 



2539 LilMERY (Nicolas) COURS de Chimie : la Mani^re de faire les Operations qui sont en usa^e 

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 plates, thick 4to. /ne copy in old calf gilt (joints cracked), with arms of King George III. in gold 

 on sides, \5s 1756 



' I^ nieilleure edition est celle donnce par Baron en 1T5G.'— L'togrr. Gin,. ' Cc livre a fait autorite en chimie pendant plus 

 de 100 ans. II a etc le guide, le code, le manuel oblige dos chiinistes du XVIIIe siecle, et memo apres le renouvellement de 

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

 point alors '.— Cuj). 



2540 LEMOINE (Georges) Etudes sur les Equilibres CniMitiUES : with woodcuts^ Svo. sewn, with 

 inscr. to Prof. A. W. Williamson, F.R.S., 3* 6rf(p. F.9.) 1881 



2541 LE MONNIER (Pierre Charles; f.r.s.) Histoire Celeste, ou Recueil de toutes les Obsery* 

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 bookplate of Philip 2nd Earl Stanhope, F.R.S. , Is 6d 1741 



2542 [ ] In.stitutions Astronomiques, avec Essai sur I'Histoire de I'Astronomie Moderne ; with 



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



' C'est un des meilleurs ouvrages qu'on ait fait en fran^ais sur I'astronomie elementaire.' — Lalande. 



2513 La Theorie des Cometes, avec Tables pour calculer les Mouvements des Cometes, du 



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

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2')44 Another Copy, old calf gilt, Is 



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



2545 LENORMAND ,(L. S.), — JANVIER, et D. MAGNIER: Nouveau Manuel Complet do 

 I'Hohloger, nouv, Ed. refondue ; with folding plates, 2 vola. 12mo. in 1, cl., os 1876 



2546 LENS (Arnoldus de, medicus ac mathematicus) In Geometrica Elementa Eisaqoge ; with 

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Antverpice, Christ. Plantinus, 1565 

 Unknown to Poggendorff. 

 •jr)i7 LEONI (Antonio Camillo, sac. Piacentino), Lo Squadro di : Trattato breve per havere Dis* 

 tan/.e de' Siti, dari il suoii Pretendenti legitinii nelle Alluvion! de' Fiumi, repararsi dalle Corrosion! 

 Fhiviali, e misuraie un' Acqua Corrente ; with front., and plates, cr. 4to. boards, uncut, lOs 



Parma, 1699 

 2518 LEOTAUD (Vincent, s. J.) Ex.VMEN CiRCULl QUADRATUR.thactenuseditarum Celeberrim.e, 

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

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2549 LEROY (Charles Fran9ois Antoine) Analyse Appliquee ii la G^ometrie des Tiiois 

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2550 Seconde Edition, augment^e ; 5 plates, Svo. hf calf (rubbed), 3s 6d 1835 



2551 Autre (2«) Edition, augment^e; 5 plates, 8vo. hf. calf, 3s 6d Li^ge, 1839 



2552 Trait6 de Geom^trie Descriptive ; tvith 60 plates, 2 vols. 4to. hf. calf, 4s 1834 



2553 Traite de St6r6otomie, 4to., with Atlas, containing 74 plates, roy. folio— 2 vols. hf. 



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2554 liESAGE (George Louis) :— Charcot (Anthelmus, Lugdunceus) Lex Natur^*: Unica, seu de 



Attractione ail Impulsionem revocata ; Theses Philosophicie, 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 

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



