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



7394 DUMAS (Jean Baptiste Andre, de I'lnstitut: F.R.S.) MKMOIRE sur la Loi des SUBSTITUTIONS 

 et la THEORIE des TYPES, 4to. (pp. 31), sewn, with author's inscr. as below, 8s Qd 1840 



' M. Richard Phillips hommage de 1'auteur J. DUMAS.' Inscr. on cover. There are also numerous marginal not^s by 

 Richard Phillips, F.K s. (1778-1851). 



One of the author's most important memoirs, in which he finally established his law of substitution and theory of types, 

 and showed the impossibility of the dualistic doctrine of Berzelius. 



7395 THESE sur la Question suivante : de FACTION du CALORIQUE sur les CORPS ORGANIQUES : 



APPLICATIONS aux OPERATIONS PHARMACEUTIQUES, 4to. seivn, uncut (scarce], 8s Qd 1838 



Giving a list of organic substances with their vapour densities, in which the author was the first to devise a generally 

 applicable method for determining them. 



7396 TRAITE de CHIMIE, applique aux Arts, 8 vols. 8vo., with Atlas, containing 147 plates, 



folio 9 vols. hf. calf gilt (nice copy), 1. Is 1828-46 



' In its treatment of the matter, and especially its arrangement, this remained a model for many subsequent text-books 

 on technology.' Prof. E. v. Meyer. 



' His researches in organic chemistry, especially his masterly papers on the ethers, ethereal oils, indigo, and the alkaloids, 

 placed him in the first rank of chemists.' 



7397 1 [et Jean Baptiste BOUSSINGAULT] : ESSAI de STATIQUE CHIMIQUE des ETRES 



ORGANISES, 2 e Edition, augmentee de Documens numeriques, Svo. sewn (scarce), 4s Qd 1842 



1 In this the life of plants and animals, and, in particular, the processes of metabolism, were treated from the chemical 

 point of view.' Prof. E. v. Meyer. 



7398 DUNCAN (Robert Kennedy, Washington and Jefferson Coll.) The NEW KNOWLEDGE : a 

 Popular Account of the New Physics and the New Chemistry in their Relation to the New 

 Theory of Matter [5th Ed.], with 54 illustrations, sq. post Svo. buckram, 4s (p. 6s nett) 1907 



7399 DUNDONALD (Archibald Cochrane, 9th Earl of) The PRESENT STATE of the MANU- 

 FACTURE of SALT explained, and a NEW MODE suggested of REFINING BRITISH SALT so as to 

 render it Equal, or Superior to the finest Foreign Salt, with Plan for abolishing the present Duties 

 and Restrictions on the Manufacture of Salt, etc., etc., 2nd Ed., with Appendix, Svo. sewn, 

 with Inscr. ' From the Author ' on flyleaf (rare), 12s Qd 1785 



7400 : ACCOUNT of the QUALITIES and USES of COAL TAR and COAL VARNISH, with CERTIFI- 

 CATES from SHIPMASTERS, etc., 8vo. (pp. 43), sewn, 7s Qd 1785 



The first work advocates an improved process of gaining salt from the sea, and contains interesting statistical 

 information. 



The second is connected with the author's discovery that coal-tav acts as an excellent preservative for wood, and 

 contains many appreciatory letters addressed to Lord Dundonald. Its success in tarri >g ships' bottoms was shortly 

 afterwards nullified by the introduction of copper sheathing. 



7401 TREATISE shewing the INTIMATE CONNECTION between AGRICULTURE and CHEMISTRY, 

 new Ed., 4to. boards, uncut (rare), 12s Qd 1803 



Sir Humphry Davy has been said to have been indebted to the above work in writing his own ' Elements of 

 Agricultural Chemistry (v. Nos. 7197-8, ante). 



1 His discoveries, now of national utility, ruined him, and deprived his posterity of their remaining paternal 

 inheritance.' Thomas 10th Enrl. 

 DUN ECHT OBSERVATORY v. CRAWFORD (Earl of) 5 ante. 



7402 DUNKERLEY (Stanley, Victoria Univ.) HYDRAULICS : HYDRAULIC MACHINERY, and 

 RESISTANCE and PROPULSION of SHIPS, ivith 384 illustrations, 2 vols. Svo. cl., 14s (p. 1. Is 

 nett) 1907-8 



7403 Vol. I : HYDRAULIC MACHINERY, with 269 illustrations, Svo. cl., 6* Qd (p. 10s Qd 



nett) 1907 



7404 - MECHANISM, with 416 illustrations, Svo. cl., with author's inscr., 5s (p. 9s nett) 1905 



7405 - SECOND [LATEST] EDITION, enlarged, with 450 illustrations, Svo. cl., Qs Qd (p. 9s nett) 1907 



7406 DTJNKIN (Edwin, F.R.S.) The MIDNIGHT SKY : Familiar Notes on the Stars and Planets, with 

 32 star-maps, and numerous woodcuts, 4to. cl., 3s Qd (p. 7s Qd) [1869] 



7407 REVISED EDITION, with 32 star-maps, and numerous woodcuts, 4to. cl. (cover and some II. 



stained), with author's inscr. and signed photo, inserted, 4s [1879] 



7408 DUNN (Samuel, teacher of mathematics) PRECEPTS, FORMULAS, TABLES, CHARTS, and 

 IMPROVEMENTS, engraved throughout upon copper on 16 II. , with folding chart, sm. 4to. boards 

 (rare), 12s Qd apud auctorem, 1784 



Not noticed in a long list of the author's works in D. N. B. It consists of Longitude Instructions (2 11.) : Formulas for 

 Longitude (3 11.) : Right Ascensions and Declinations of Fixed Stars (1 1.) : Formulas for Latitude (8 11.) : Points and 

 Degrees of the Compass Card (11.): and Table of Equation of Time (folding 1.). 



7409 DUNRAVEN and MOUNT EARL (Windham Thomas Wyndham-Quin, 4th Earl of, 

 K.P. ; Extra Master) SELF-INSTRUCTION in the PRACTICE and THEORY of NAVIGATION, enlarged 

 Ed. , with charts, and numerous diagrams, 3 vols. Svo. buckram, t. e. g., 16s 6t:/ (p. 1 . 5s Qd nett ) 1908 



Few yachtsmen have ever become quite such accomplished seamen as Loid Dunraven. 



7410 DUPAIN [-MONTESSON] (-) La SCIENCE des OMBRES, par Rapport au DESSEIX : Regies 

 d6montr6es pour connoitre 1'Espece, la Forme, la Longueur, et la Largeur des Ombres que les 

 diffdrens Corps portent, et qu'ils produisent tant sur des Surfaces horisontales, verticales, ou 

 incline'es, que sur des Surfaces verticales, plates, convexes, ou concaves ; with 18 folding copper- 

 plates, Svo. old calf, 8s 1750 



'II enseigna au due de Berry (depuis Louis XVI) la levee des plans.' fiiogr. Gen. 



7411 DUPLAIS (P., aine) TRAITE des LIQUEURS, et de la DISTILLATION des ALCOOLS, con tenant 

 les Precedes les plus nouveaux pour la Fabrication des Liqueurs francaises et etrangeres ; Fruits 

 jt l'Eau-de-Vie et au Sucre ; Eaux et Esprits parf nine's, Vermouts, EAUX et BOISSONS GAZEUSES, 

 et Description complete des Operations necessaires pour la Distillation de tons les Aloools, 2 e Ed.; 

 with Infolding plates, 2 vols. Svo. sewn, 5s 1858 



7412 DUPUIT (Jules) ESSAI et EXPERIENCES sur le TIRAGE des VOITURES, et sur le FROTTEMENT 

 de SECONDE ESPECE, suivis de Considerations sur les diverses Especes de Routes, la Police du 

 Roulage, et la Construction des Roues ; with folding plate, Svo. sewn, 4s 1837 



