HENRY SOTHERAN & CO.. 140. STRAND, W.C, and 37. PICCADILLY, W. 329 



6+24 BOYLE (Hon. Robert; f.r.s. ; founder of the Jioyle Lecturer) Nkw Expkrimknts Physico- 

 Mechanicall, touching' the Spring of the Air. and its Effects (made, for the most part, in a New 

 Fneumatical Engine), second Edition, whereunto is added a Defence of the Author's Expli- 

 cation of the Experiments, against the Objections of Franciscus Linus, and Thomas Hobbks, 

 ivith 2 copperplates [one folding), »m. 4to./ne copy in old calf (very rare), £I. 15s 



^ , . . ,^ ,^ . . ,. , . , Oxford, H. Hall, 1662 



Contair.ingtheauthors invention of an unproved air-pnmp (' niachina Boyleana), 'presentinR all the essential qual- 

 ities of the modern niachnip. By a multitude of experiments iwrformed with it, Boyle vividly illustrated Uie elfecte (at 

 that time very imperfectly recognised) of the elasticity, compressibilitv, and weight of the air; invMtiintad Ita funcUon 

 in respiration, combustion, and conveyance of sound, and explotied the obscure notion otAfuga vacui.'—Agnit U. ci$rk« 



The above edition is of special importance, a* it first contuin.'< uhat is mic known as Itonle't Law. ' The ' Defence asiliMt 

 Linus • contained experimental proof of the pror>ortional relation between elasticity and prensure atiU known M £ov<«'t 

 Imw. This approximately true principle, although hnwely demonstrated, was at once gwneniUMd end eeoepted. end wee 

 confirmed by Mariotte [under whose name it is generally known on the Cuutinent] in l67t\.'—Ba(Uwk. 



BISHOP BURNET'S COPY: 



6425 Continuation of New Experiments. Physico-Mechanical, touching the Spring and 



Weight of the Air, and their Effects. The I. Part, with a short Discourse of the Atmospherf:s 

 of Consistent Bodies, first edition, with 8 fine platen on copper, sm. 4to. contemporary calf 

 {a sound and large copy) ; rare, %vith armorial bookplate o/" Gilbert Bubnkt at lip. of S&rwwi, 

 £1. 55 fb., a. «.. 1669 



Specially valuable for giving a description of his air-pump es improved by Robert Hookb, K.B.e., the euthor'e eaeUteut 

 — si)oken of as the ' second Engine ' in this work. 



6426 The Sceptical Chymist : or Chymico-Physical Doubts and Paradoxes, touching the 



Spa<,'yrist's Principles commonly call'd HyposUtical, as they are wont to lie Propoe'd and Defended 

 by the Generality of Alchymists, whereunto is pnijmiH'd Part of another DiKCOurne relating to the 

 same Subject, first edition, sm. 8vo. old cheep (very rare), with bookplate of John SkerwtH, 

 M.D., sold J. Cad^nellfor J Crook€, 1661 



One of the most important, as well as by far the rarest, of all the author's writings, ei*i>iH^-ially in the ebovf Bret edition. 

 It was reprint^'d in 1080. The above copy has a duplicate title, reading: 'The Sceptical Chymist: or Chynilco-Phjreicet 

 Doubts and Paradoxes, touching the Experiments whereby Vulgar Sptgyrists are wont U» Endeavour to Evince their 8elt, 

 Sulphur, and Mercury, to be the true Piinciples of Things, Printed for J. Cr<nke, ltJ<il.' 



'In the 'Sceptical Chymist* he virtually demolishes!, together with the perijiatetlr ditctrine of f«»ar element!, the 

 Spagyristic doctrine of the tria prinut, tentatively substituting the principles of a ' mechanical philosophy ', expoonded in 

 detail in his ' Origin of Formes and Qual ties' [7. v. nupnt'].'—!). N. li. 



' In his Sceptical Chymist he criticises the Aristotelian and the alchemlstic elements, which were still eooepted by meoy 

 of the iatro-ohemical age. He enunciate*! the axiom that only what can be demonstmtAl to Ihj the undeonmpoeeble con- 

 stituents of bodies are to be regardei as elements. . . . With a far-seeing glance he looked forwanl U) the dfitcjvery of a 

 much greater number of elements than was at that time assumed, at the same time contending that many of the au" 

 then h^ld to be elementary were not really so. . . . Boyle was the llrst to state with perfect cleerufMs ttiattc 

 compound results from the combination of two constituents, and that It iKiisesses properties totally different ftom 1 

 of either its constituents alone, thus enabling him to draw a sharp distinction between mixtures end chemical eompoonde.' 

 —Prof. E. V. Meyer. 



6427 Some Considerations touching the Usefulne.sse of Experimental Naturall 



Philosophy, propos'd in a Familiar Discourse to a Friend, by way of Invitation to the Study of 

 it, 2nd Ed., 4to. original calf, lOs Qd Oxford, H. Hall, 1664 



Containing an interesting preface by Robkrt Sharroc-k, Archdn. of Winchester. 



' I scruple not to acknowle<ige there are things that incline me to suspect, that some In the world . . . may here 

 Arcitna, to which most of the Processes I reserve may prove little more tlun Trifles '.—Author* yrrfuct. This peeaeKe is 

 interesting as first avowing his belief In alchemy. 



6428 Tracts containing New E.xperiments, touching the Relation betwixt Flame and AiB. 



And about Explosions. An Hydro.statical Dlscourse occasion'd by some Obje<tionM of 

 Dr. Henry More against some Explications of New ExperimentH made by the Author, with tux 

 Hydrostatical Letter, dilucidating an Experiment about a Way of Weigliinu Wat«r in Water. 

 New Experiments of the Positive and Relative Levity of Bodies under Water, of the Air'M 

 Spring on Bodies under Water, and about the Differing Pressure of Heavy SolidM and Fluide, 

 first edition, large 12mo. old calf, or, old sheep (RARE). 10* %d R. Iktois, 1672 



Containing the author's important investigations on specific gravity. 



It includes chapters 'Of the Dittlculty of prrxluclng and pre^rvlng Flame without Air'. 'Of the PmpeREtloa of 

 Actual Flame in Vacuo Boyliano', 'New Experim»»nts about the Relation betwixt Alrend the Flenime VitalUof Anlmtle', 

 ' Of the Pressure of the Air's Spring on B«)die» under Water ', etc. etc. 



6429 Tracts: containing I. Suspicions about some Hidden (Qualities of the Air: with 



Appendix touching CELE.STIAL Ma(;nets, and some other Particulars. II. ANIMADVBRSIONH 

 upon Mr. Hobhes's Problemata de Vacuo. III. DISCOURSE of the CAUSE of ATTRACTION by 

 Suction, first edition, 12mo. old calf, newly rebaeked (RARE), 17« 6rf ^f. Pitt, 1674 



Containing also a chapter on tlw ' Preservation of H<Mlleii In Vecuo Dovlieno'. 



6430 [ ] Tracts consisting of Observations about the Saltness of the Sea : Account of the 



Statical Hygroscope and its Uses; the Force of the Air's Moisture; the Natural and 

 Preternatural State of Bodies, and a Sceptical Dialogue about the Positive or Privative 

 Nature of Cold, with some Ex|»eriment8, by a Member of the Royal Society, first edition, 

 sm. 8vo. old sheep, newly rebcu^ed ^KXRE), lis 6d E. Flesher, 1074 



6431 [ ] Second Edition, sm. 8vo. original sheep, 12* %d S. Smith, 1690 



Describing some of the author's moit Interesting Investigatiuns, and exploditw the Ariebtt^ien doctrine then held that 

 the .saltness of the sea w.is found only on Its Hurfece. He elso explains the origin of the eelte In the see, showa how to 

 make .sea water drinkable by distillation end freezing, end eacerulns lt« density. 



6432 BRACKENBURY (Charles Ernest. A.M. I.e. E.) British Pro<jrf.ss in (; as Works Plant 

 and Machinery, vith 1 13 illustrations {including 5 plates), roy. 8vo. boards, ^ 6d (p. 6» nett) 190.5 



6433 BRADLEY (Thomas) Practical Geometry, Linear Perspfxttive, and Pro.iection, 

 includincj Isometrical Perspective, Projections of the Sphere, and the Projection of Shadows, with 

 Description of the Principal Instruments used, etc., 8 plales and numeroun woodcuts, 8vo. c/ , 

 Zs^d S. D V. K. [1834J 



