HENRY SOTHERAN & CO., 140, STRAND, W.C., AND 43, PICCADILLY, W. 777 



15444 WALLENTIN (Ignaz) EINLEITUNG indie THEORETISCHE ELEKTRIZITATSLEHRE; with 81 

 diagrams, 8vo. cL, 7* rf (p. M. 12) Leipzig, 1904 



15445 WALLERITJS (Johan Gottskalk, Univ. Upsala) ELEMENTS d' AGRICULTURE Physique et 

 Chimique, traduits du Latin, \2mo.Jine copy in contemporary calf extra, with auto, of Richard 

 Watson, F.R.S., absentee Bp. of Llanda/(il37-lS].Q), and his Calgarth Park book-label, Is 6d 



Yverdon, 1766 



An important work in which the author bases the principles of agriculture on a comparative study of the chemical 

 constitution of plants and the soil. 



Bishop Watson bought this book to improve his estate in Westmorland, where he lived while Bishop of Llandaff, and 

 took to planting, and what Wordsworth called a vegetable manufactory, while his sons ' merrily pursued cockflghting ', 

 and the natural result ensued 98 years post mortem in the disendowment of the Church in Wales. 



15446 PHYSISCHE CHEMIE : Natur und Beschaffenheit der Chemie iiberhaupt, ihre Geschichte 



u. s. w. ; von den Salzen, dem Schwefel, dem schwefelichten und erdharzigen Korpern ; von den 

 7 halben und 7 ganzen Metallen, und den Produkten derselben, iibersetzt mit Anmerkungen von 

 C. A. MANGOLD und C. E. WEIGEL (Bd. I 2. Aufiage, mit Anmerkungen von C. E. Weigel) ; 2 

 vols. 8vo. in 3, sewn, 5s Leipzig, 17 '80-7 6 



The author was Bergman's predecessor as professor of chemistry at Upsala. He promoted the study of mineralogy by 

 giving a more systematic arrangement of minerals. 



15447 WALLIS (John, D.D., F.R.S., Savilian Prof.) DISCOURSE of GRAVITY and GRAVITATION, 

 grounded on Experimental Observations presented to the Royal Society, November 12, 1674, with 

 folding plate, sm. 4to. (pp. 36), hf. brown ca//(RARE), 1. Is J- Martyn, 1675 



Interesting as a discourse on the subject on the eve of the discovery of the law of gravitation by Sir Isaac Newton. The 

 work contains many experiments in illustration. 



15448 INSTITUTIO LOGICS, ad communes Usus accommodata, Editio VI., auctior et emend- 



atior, large 12mo. old sheep, rebacked, with auto, of Sam. Roberts, F.R.S., 5s Oxonii, 1763 



15449 MECHANICA : sive, de MOTU, TRACT ATUS GEOMETRICUS, Pars I. in qua, de Motu 



Generalia ; de Gravium Descensu, et Motuum Declivitate; de Libra. Pars II. in qua, de Centro 

 Gravitatis, ej usque Calculo. Pars III. in qua, de Vecte, de Axe in Paritrochio, de Trochlea, de 

 Cochlea, de Motibns Compositis, de Percussione, de Cuneo, de Elatere, et Resilitione seu 

 Reflexione, de Hydrostaticis, et Aeris ^quipondio, variisque Questionibus Mathematicis, editio 

 princeps ; with finely engraved portrait by W. FAITHORNE, and 17 folding plates, 3 vols. 4to. in 1, 

 sound and large copy in contemporary ca//(VERY RARE), 2. 10s Londini, Gul. Godbid, 1670-1 



One of the classics of mechanics, containing the first exhaustive treatment of the theory of the collision of bodies con- 

 sidered as imperfectly elastic bodies being the solution of a problem propounded by the Royal Society while Sir 

 Christopher Wren and Huygens treated the subject simultaneously, but confined their theory to perfectly elastic bodies. 

 On these investigations, according to Prof. Mach, Sir Isaac Newton based his researches contained in the Principia. 



' Wallis geht von dem Grundsatze aus, dass das Moment, das Produkt aus der Masse (Pondus) und der Geschwindigkeit 

 (Celeritas), bei dem Stosse maassgebend sei. Durch dieses Moment wird die Kraft des Stosses bestimmt. Stossen zwei 

 (unelastische) Korper mit gleichen Momenten aufeinander, so besteht nach dem Stoss Ruhe. Bei ungleichen Moinenteu 

 ergibt die Differenz der Momente das Moment nach dem Stosse.' Prof. Mach. 



The third volume is especially rare, and often wanting. 



15450 PARS I. (de Motu Generalia, de Gravium Descensu, et Motuum Declivitate, de 



Libra) ; with 2 folding plates, 4to. old calf (roughly rebacked), 15s ibidem, apud eundem, 1670 

 15451 - - OPERTJM MATHEMATICORUM PARS ALTERA : qua continentur de Angulo Contactus et 

 Semicircuii Disquisitio Geometrica ; de Sectionibus Conicis Tractatus ; Arithmetica Infinitorum, 

 sive de Curvilineorum Quadratura, etc. ; Eclipseos Solaris Observatio : with folding copperplate, 

 and numerous diagrams, sm. 4to. contemporary English calf (joints cracked), with auto, of Sam. 

 Roberts, F.R.S., 1. 5s Oxonii, L. Lichfield, 1656 



The above volume contains the treatises mentioned on title, each having a separate title and pagination, and includes 

 the first appearance of the celebrated Arithmetica Infinitorum, ' the most stimulating mathematical work so far published 

 in England. Newton read it with delight when an undergraduate, and derived immediately from it his binomial theorem. 

 It contained the germs of the differential calculus, and gave, in everything but form, advanced specimens of the integral 

 calculus ' (D. N. B) ; and in de Sectionilus Conicis the first clear exposition of Descartes's invention of analytical geometry. 



This collected edition was unknown to Lowndes, Allibone, Watt, and Poggendorff, and is VERY RARE ; while most of 

 the treatises it contains appear here for the first time. 



15452- THOM.E HOBBES QUADRATURA CIRCULI; CUBATIO SPH^IR^, DUPLICATIO CUBI ; 

 CONFUTATA ; with 2 folding plates, sm. 4to. sprinkled calf neat, uncut (rare), 10s Qd 



ibidem, typis Lichfieldianis, 1669 



' In a long-drawn controversy he exposed the geometrical imbecility of Thomas Hobbes [the philosopher]. It excited 

 much public interest; but after the death of his adversary, Wallis declined to reprint the scathing pamphlets he had 

 directed against him while alive.' D. N. B. See Nos. 1947-51 and 9342 ante. 



15453 TREATISE of ALGEBRA, both Historical and Practical, with some Additional Treatises, 



I. Of the Cono-Cuneus. II. Of Angular Sections. III. Of the Angle of Contact. IV. Of Com- 

 binations, Alternations, and Aliquot Parts, first edition, with fine portrait by D. Loggan 

 (splendid impression), folding plates, and numerous diagrams, folio, old calf (RARE), 1.1* 



J. Play ford, 1685 



The above copy contains at end ' A Brief (but full) Account of the Doctrine of Trigonometry, both Plain arid Spherical ', 

 by JOHN CASWELL (pp. 17), 1685, and has the portrait, which is often missing. 



'In 1685 Wallis published an Algebra, preceded by an historical account of the development of the subject, which 

 contains a great deal of valuable information. This algebra is noteworthy as containing the first systematic use of formulae. 

 A given magnitude is here represented by the numerical ratio which it bears to the unit of the same kind of magnitude', 

 etc. etc. etc. W. W. R. Ball.' 



15454 WARREN (Erasmus, Rector of Worlington, Sujfolk) GEOLOGIA: or a Discourse concerning 

 the Earth BEFORE THE DELUGE, wherein the Form and Properties ascribed to it, in a Book 

 intituled The Theory of the Earth, are excepted against : and it is made appear, that the 

 Dissolution of that Earth was not the Cause of the Universal Flood ; also a New Explication of 

 that Flood is attempted, with 4 engravings on copper, sm. 4to. hf. calf (fine copy), Is 6d 



R. Chiswell, 1690 

 An attempt to answer Thomas Burnet's ' Theory of the Earth' (v. No. 64(5 ante). 



