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



2515 LEE (Arthur BoUes) The Microtomist's Vade-Mecum, 3rd Ed., with diagrams, 8vo. cl., 6s 

 (p. 14^)' 1893 



2516 LEFEVRE [latine 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 pliysicis. 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, Uenr. Petrus, [col.] 1536 



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

 Biographie Generale. Nothing seems to be known of Christiern Morssian. 



9ol7 LEFEVRE (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 ; ivith plates, 

 8vo. cl., 2s 1823 



2520 Other Copies, hf. bound, 2s 6d • 1823, '51, etc. 



2521 Nouvelle Edition, avec Additions et Modifications par Alphonse Blanchet ; suivie 



de la 15^ Ed. donn^e par Legendre ; with diagrams — 2 vols. 8vo. in 1, hf. cl., 3s 1849[-3] 



2522 ViNGTii:ME Edition [revue et augmentee] ; tvith diagrams, 8vo. sewn, 2s 6d 1876 



• The later editions contain proofs of the irrationality of n and tt^. 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), 12s 6d 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 Tran.scendantes et sur les 



Quadratures, avec le Supplement a la Premiicre Partie; mjjYA plates, 3 vols. 4to. in 2, hf. calf 

 {wanting title to v. I) ; VERY scarce, £3. 3*' 1811-17-16 



' The third and most of the tirst 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.'— W. W. R. Ball. The third volume contains : 'Construction des 

 Tables Elliptiques ' (pp. 3-124) and Tables I-V (pp. 47), with 1 title dated 1816. 



2525 Theorie des Nombres, 3« [la meilleure] edition, 2 vols. 4to. seivn, uncut (fine 



copy) ; VERY RARE, £3. Didot, 1830 



Thk BK3T EDITION, NOW EXCESSIVELY scARCK. 'The third cdition, issued in 1830, includes the results of his various 

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

 as was possible by the application of ordinary algebra.'— ir. W. R. Ball, llie law of quadratic reciprocity, which 

 connects any two odd primes, was first proved in tliis 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^ f by^ -f c/^ -= 0.'— Jr. W. R. Ball. 



2526 Traite des Fonctions Elliptiques et des Integrales Euli^:riennes, 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 : J.\coiji (Oiistav Jacob) Fuudamenta Nova Tlicoriae Functionum Ellipticarum, 4to. 

 Regiomonti, 1829. 



' The most important of Legendre's woi-ks. 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 iin])arted to the subject that 

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

 root of a polynomial of the fourth degree in ;r, he showed that such integrals can be bro ught back to th ree canonical forms, 

 designated by F ((^), E (</>) and TT (<^), the radical being expressed in the forms A (<^) = V 1 — '"^^ «'"^ 4>- He also undertook 

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

 supply tlie means of integrating a large number of differentials.'— i'roA Cajori. 



2527 liE GIVRE [Latine GIURIUS] (Pierre, m.d.) Arcanum Acidularum novissime 

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

 Aquarum Mineralium Aciditate convellitur. Additae sunt Epistolre nuiltorum illustr. 

 Medicorum cum ejusdem Kesponsis, 18mo. old limp vellum (rare), lOs 6d Amstelodami, 1682 



' Uemonsti-at quoque vitriolnm habere eandem sympathiam cum tere, quani habet alumen cum ferro, aquasquo 

 ferrwgineas nullum vitriolum continore, quia istud )iiinerale ferrum alteratatque in ;es convertit, sed illassuam aciditat«m 

 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 Elome, 

 ruled with red ink, ivith about 100 curious plates, folio, old hf russia, lOs Qd 1694 



' A Cartesian philosopher of great note,'— .4n(. 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), \6 plates, 4to.— 4 vols., with auto, of Prof A. W. Williamson, F.R.S., lOs 6d 



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 6c7(p. M. 8. unbound) Leipzig, 1885 



An important work by the originator of molecular physics. 



2531 LEIBNIZ (Gottfried Wilhelm Freiherr v.) Opera Omnia, nunc primum collecta, in Classes 

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

 P. Savart, 6 thick vols. 4to. sound copy in contemporary white vellum (rare), £3. 3* Genevan, 1768 



' Collection tres-rechcrchee. '—ZJrnnet. It contains the ' eloge'" by Font-enelle, and a life by Jacob Brucker. 



: Recueil de Diverses Pieces (1720)— i?. Newtoniana, post. 



