118 HENRY SOTHEKAN & CO., UO, STRAND, W.C, and 37, PICCADILLY, W. 



233S KtJsrEL (Guido, Ophir Works) Nevada and California Processes of Silver and Gold 

 Extraction, etc. etc., with the General Metallurgy of Silver Ores, II plates, large 8vo. cl., 5s 1868 



2339 LA BECHE (Sir Henry Thomas de, f.r.s., foimder of S. Kensinc/ton School of Mines) 

 Inaugural Discourse at the Opening of the School of Mines, South Kensington, Nov. 6th, 

 1851, 8vo. (pp. 24), sewn, 3s 1851 



2310 The Geological Observer, with SOD woodcuts, 8vo. (pp. 887), hf. morocco {scarce), 8s 1851 



2341 Report on the Geology of Cornwall, Devon, and West Somerset, with 11 plates 



and coloured map {all folding), besides icoodcuts, thick 8vo. c/., uncut {cover slightly damaged), 

 scarce, \c>s 1839 



' It is not too much to say that the publication of these works [the above two] would alone have placed him in the 

 first rank of geologists. In them he exhibits the most varied acquirements, applying almost every branch of science to 

 the elucidation of geological facts. Notwithstanding the rapid advancement of geological knowledge, these books will 

 long continue to be well worthy of the earnest study of every geologist.' — Prof. W. J. Harrison. 



2342 Selection of the Geological Memoirs contained in the Annales des Mines, with 



Synoptical Table of Equivalent Formations and M. Brongniart's Table of the Classifi- 

 cation of Mixed Rocks, trans., with Notes, 11 folding plata and mcips {some coloured), 8vo. cl, 

 6s 6d 1824 



The author's first published work. 



2343 LA CAILLE (Abbe Nicolas Louis de ; f.r.s.) Lecons Elementaires d'AsTRONOMiE 

 g^ometrique et physique; nouv. ; A. augmentee ; ivith plates, 8vo. old calf gilt, 4.9 1755 



2344 Another Copy, old calf gilt, with auto. [Professor] 'Alex. W. Williamson [F.R.S.]. 



Paris. 1848 ' 07i reverse of title, 5s 1761 



2345 Another Copy, old calf extra {fine copy), with bookplate of Charles Srd Earl Stanhope, 



F.B.S., 6s , 1764 



23*6 Lemons Elementaires de Mathematiques ; nouv. Edition par I'Abb^ Marie ; with 



plates, 8vo. old calf gilt, u'ith Lord Stanhope^s bookplate, 4* 1770 



2347 LA GHAMBRE (Marin Cureau de) Nouvelles Observations et Conjectures sur I'Iris ; 

 with engravings, 4to. old calf gilt, 7s 6d 1650 



2348 LA CHAPELLE (Abbe N. de ; f.r.s.) Traite des Sections Coniques, et autres Courbes 

 anciennes, avec un petit Traite de la Cicloide, oil Ton fait voir comment cette Courbe a contribue 

 a perfectionner les Horloges a Pendule, des Dissertations historiques sur I'Origine des Sciences 

 etc. ; loith 10 folding plates, 8vo. old calf gilt {rare), 105 6d 1765 



2349 LA COND AMINE (Charles Marie de) Journal du Voyage fait par Ordre du Roi h. 

 I'Equateur, servant d 'Introduction historique a la Mesure des trois premiers Degres du 

 Meridien ; with fine plates and maps {chiefly folding)^ '51 ; avec les 2 Supplements, '52-4 — 

 3 vols. 4to. in 2, old calf gilt (RARE), £1. Is ' 1751-4 



The supplements also contain the author's reply to Bouguer, who attacked him shortly after their return to France. 



2350 Mesure des Trois Premiers Degres du Meridien dans I'Hemisphere Austral ; 



u-ith S folding plates, and vignette, 4to. old calf gilt {rare), \2s 6d Imprimerie Royale, 1751 



These two works form the account of the author's geodetic mission to Peru, in conjunction with Bouguer, for 

 measuring the meridian near the equator, co-operating with another mission sent to Lapland and led by Maupertuis 

 (7. V. post), Clairaut, and Celsius, to measure the meridian near the north pole. The result of these two missions first 

 established the correctness of Newton's views of the earth having the shape of an ellipsoid— a fact previously much 

 doubted as the result of a faulty meridian-measurement by Cassini and Picard. 



* This is the account of the scicntillc operations, divided into 2 parts. The first relates to the geodetical measurements, 

 and the second to the astronomical observations. Pp. 239-58 contain an imi>ortant discussion of Picard's operations'. — 

 I'rof. Todhunfer. 



2351 LACOTE (Auguste) SYNTHi<:SE des Corps Azotes, roy. 8vo. seivn. Is 1880 



2352 LACKOIX ( — de, Commissary General of the Marine) Abstract on the Mechanism of the 

 Motions of Floating Bodies, trans, by Adml. [Sir Charles] Knowles, plate, 4to. (pp. 53), 

 sewn, 5s 1775 



' Containing more knowledge in the art of ship-building than any other book hitherto published that 1 have met with.'— 

 Treface. , , , 



2353 LACROIX (Sylvestre Francois) Elemens d'ALGEBRE, 16^ Ed. : Complement, 6« Ed.— 

 2 vols. 8vo. in 1, hf. calf, 2s 6d 1836-5 



2354 XXIIIe Edition, revue, corrig^e et annotee par E. Prouhet, Svo. hf. brown morocco neat, 



45 , 1871 



2355 ELEMEN-rs de Geometrie, 16® Ed. ; with 9 plates, Svo. hf. calf gilt {tiice copy), 2s 1848 



2356 XVIII« Edition, redi^ee par E. Prouhet ; with diagrams, Svo. hf. brown morocco neat 



imiform with Nos. 2354 and 2366), 2s 6d , 1872 



2357 Traite du Calcul Differentiel et du Calcul Integral, 2® [demi^re] Ed., revue et 



augmentee ; with folding plates, 3 vols. 4to. Qiew hf. buckram {rare), £1. 2* 6d 1810-19 



2358 Another Copy, hf. calf, £\.\s 



The first exhaustive treatise on the subject ever written, and still of some value. 



2359 Traite Elementaire de Calcul Differentiel et Integral, 5® Ed., augmentee ; 



with plates, Svo. boards, or, hf. calf, 2s Qd 1837 



2360 HuiTiEME Edition, revue et augmentee de Notes par C. Hermite et J. A. Serret ; 



with 5 folding plates, 2 vols. Svo. hf. calf, 8s (p. F. 15. unbound) 1874 



2361 Elementary Treatise on the Differential and Integral Calculus, trans., with 



Appendix and Notes [pp. 250, by Charles Babbage, Sir John Frederick William Herschel, 

 and George Peacock, Dean of Ely, ff-B-.s.], 2vith 5 plates, thick Svo. boards, uncut {scaixe), 

 12s 6d Cambridge, 1816 



2362 Another Copy, hf. calf gilt {nice copy), 145 



' This translation gave the first impulse to a mathematical revival in England, by the introduction of the refined 

 analytical methods and the more perfect notation in use on the continent.' — D.N.B. The appendix on finite differences by 

 Sir John Herschel was styled by Prof. Tait ' one of the most charming mathematical works ever written.* 



