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



2515 LEE (Arthur Bolles) The MICROTOMIST'S VADE-MECUM, 3rd Ed., with diagrams, 8vo. cl., Qs 

 (p. 14s\ 



2516 LEFEVRE [latinc FABER Stapulensis] (Jacques) : ARITHMETICA SPECULATIVA BOETII 

 per JACOBUM FABRUM STAPULENSEM in compendium redacta. ARITHMETICA PRACTICA 

 Christierni Morssiani in V partes digesta. I. de numeris integris. II. de fractionibus 

 vulgaribus et physicis. III. de regulis quibusdam. IV. de progressione et radicum extractione. 

 V. de proportionibus ; with symbolical woodcut on last I., 18mo. sewn (FINE COPY) ; very rare, 

 2. 105 Basilece, Henr. Petrus, [col.] 153(5 



This edition was unknown to Poggcndorff and Prof, de Morgan, nor is it mentioned in a long list of Lefevre's works in 

 Biographic Generate. Nothing seems to be known of CHRISTIERN MORSSIAN. 



2517 LEFEVBE (Julien) La SPECTROMETRIE : APPAREILS ET MESURES; illustrated, post 8vo. 

 sewn, Is [1896] 



2518 - - La SPECTROSCOPIE ; illustrated, post 8vo. sewn, \s [1896] 



2519 LEGENDRE (Adrien Marie ; F.R.S.) ELEMENTS de GEOMETRIE, avec Notes ; with plates, 

 8vo. cl., 2s 1823 



2520 - OTHER COPIES, hf. bound, 2s Qd 1823, '51, etc. 



2521 - NOUVELLE EDITION, avec Additions et Modifications par ALPHONSE BLANCHET ; suivie 

 de la 15 e Ed. donne"e j>ar LEGENDRE ; with diagrams 2 vols. 8vo. in 1, hf. cl., 3s 1849[-3] 



2522 -- ViNGTlEME EDITION [revue et augmentee] ; with diagrams, 8vo. sewn, 2* Qd 1876 



' The later editions contain proofs of the irrationality of n and n- 2 . An' appendix on the difficult question of the 

 theory of parallel lines was issued in 1803, and is bound up with most of the subsequent editions.' W. W. R. Ball. 



2523 - ELEMENTS of GEOMETRY and TRIGONOMETRY, with Notes, trans, from the French ; ed. 

 by SIR DAVID BREWSTER, F.R.S., with Notes, Additions, and INTRODUCTORY CHAPTER on 

 PROPORTION [by THOMAS CARLYLE], diagrams, 8vo. cl. (scarce}, 12-9 Qd Edin., 1824 



Of special interest for the essay by the historian his only contribution to the exact sciences. 



2524 - EXERCICES de CALCUL INTEGRAL sur diverses Ordres de Transcendantes et sur les 

 Quadratures, avec le SUPPLEMENT a la PREMIERE PARTIE ; with plates, 3 vols. 4to. in 2, hf. calf 

 (wanting title to v. I) ; VERY SCARCE, 3. 3s 1811-17-16 



' The third and most of the first volume are devoted to elliptic functions . . . The contents of the remainder of the 

 treatise are of a miscellaneous character ; they include integration by series, definite integrals, and in particular an 

 elaborate discussion of the Beta and Gamma functions.' IF. W. R. Ball. The third volume contains: 'Construction des 

 Tables Elliptiques ' (pp. 3-124) and Tables I-V (pp. 47), with 1 title dated 181G. 



0525 --- THEORIE des NOMBRES, 3 e [LA MEILLEURE] EDITION, 2 vols. 4to. sewn, UNCUT (FINE 

 COPY) ; VERY RARE, 3. Didot, 1830 



THE BEST EDITION, NOW EXCESSIVELY SCARCE. 'The third edition, issued in 1830, includes the results of his various 

 later papers, and still remains a standard work on the subject. It may be said that he here carried the subject as fat- 

 as was possible by the application of ordinary algebra.' W. W. 11. Hall. Ihe law of quadratic reciprocity, which 

 connects any two odd primes, was first proved in this book. Gauss called the proposition 'the gem of arithmetic.' . . 

 This work also contains the useful theorem by which, when it is possible, an indeterminate equation of the 2nd degree 

 can be reduced to the form ax 2 -f by 2 + cz 2 = Q.'W. W. R. Ball. 



2526 -- TRAITE des FONCTIONS ELLIPTIQUES et des INTEGRALES EULERIENNES, avec Tables pour 

 en faciliter le Calcul numerique ; with folding plates, 3 vols. 4to. hf. morocco gilt (fine copy) ; VERY 

 SCARCE, 8. 8s ' 1825-6-8 



Bound up with vol. Ill is : JACOBI (Gustav Jacob) Fundamenta Nova Theoriae Functionum Ellipticarum, 4to. 

 Regiomonti, 1829. 



' The most important of Legendre's works. He took up the subject where Euler, Landen, and Lagrange had left it, 

 and for 40 years was the only one to cultivate this new branch of analysis ... He imparted to the subject that 

 connexion and arrangement which belongs to an independent science. Starting with :m integral depending upon the square 

 root of a polynomial of the fourth degree in x, he showed that such integrals can be brought back to three canonical forms, 



designated by F (</>), E (<) and IT (<), the radical being expressed in the forms A (<f>) = V 1 k* sin" <J>. He also undertook 

 the prodigious task of calculating tables of arcs of the ellipse for different degrees of amplitude and eccentricity, which 

 supply ttie means of integrating a large number of differentials.' 1'rof. Cajori. 



2527 LE GIVRE [Latine GIURIUS] (Pierre, M.D.) ARCANUM ACIDULARUM novissime 

 proditum. Principiorum Chymicorum Disquisitionis Auxilio, in quo communis Opinio de 

 AQUARUM MINERALIUM ACIDITATE convellitur. Additae sunt Epistolie nniltorum illustr. 

 Medicorum cum ejusdem Ilesponsis, 18mo. old limp vellum (rare], 10s Qd Amstelodami, 1682 



' Demonstrat quoque vitriolum habere eandem sympathiam cum KM - e, quam habet alumen cum ferro, aquasqun 

 ferrugineas nullum vitriolum continere, qnia istud minerale ferrum alteratatque in ;v,-s convertit, sed illassuam aciditatem 

 trahere ab alumine.' Preface. 



2528 LE GRAND (Antoine, O.S.F.) ENTIRE BODY of PHILOSOPHY, according to the PRINCIPLES of 

 REN ATE DES CARTES, trans., with large Additions never yet published, by RICHARD BLOME, 

 ruled with red ink, with about 100 curious plates, folio, old hf. russia, 10s Qd 1694 



' A Cartesian philosopher of great note.' Ant. a Wood. 



2529 LEHMANN (Carl Gotthelf) PHYSIOLOGICAL CHEMISTRY, trans, from the 2nd Ed. by 

 GEORGE E. DAY, F.R.S. , 3 vols. 8vo. cl. : ATLAS of PHYSIOLOGICAL CHEMISTRY, by OTTO FUNKE 

 (SUPPLEMENT), 15 plates, 4to. 4 vols., with auto, of Prof. A. W. Williamson, F.R.S., 10s Qd 



Cavendish Soc., 1851-4 



2530 LEHMANN (Otto, Karlsruhe) PHYSIKALISCHE TECHNIK, speciell Anleitung zur Selbstan- 

 fertigung physikalischer Apparate ; with 17 plates and 882 woodcuts, 8vo. hf. maroon morocco, 

 5s Qd (p. M. 8. unbound) Leipzig, 1885 



An important work by the originator of molecular physics. 



2531 LEIBNIZ (Gottfried WilJielin Freiherr v.) OPERA OMNIA, mine primum collecta, in Classes 

 distributa, Praifationibus et Indicibus exornata, studio LUDOVICI DUTENS ; with fine portrait by 

 P. Savart, 6 thick vols. 4to. sound copy in contemporary white vellum (RARE), 3. 3s Geneva, 1768 



' Collection t. es-recherchee.' Brunei. It contains the 'eloge'*by Fontenelle, and a life by Jacob Brucker. 



- - : RECUEIL de DIVERSES PIECES (1720) v. NEWTONIANA, post. 



