HENRY SOTHERAN & CO., 140, STRAND, W.C., AND 43, PICCADILLY, W. 459 



9083 HEDGES (Killing-worth, M.I.C.E.) CONTINENTAL ELECTRIC LIGHT CENTRAL STATIONS, with 

 Notes on the Methods in Actual Practice for Distributing Electricity in Towns, with 25 folding 

 plates, and 144 other illustrations, 4to. cl., 3s Qd (p. 15*) 1892 



9084 HEDLEY (John, Colliery Viewer) PRACTICAL TREATISE on the WORKING and VENTILATION 

 of COAL MINES, with Suggestions for Improvements in Mining, with 16 folding plates, roy. 8vo. 

 cl., 5s 1851 



9085 - ANOTHER COPY, hf. morocco neat, 6s 



9086 HEDRICK (Henry B.) CATALOGUE of [1607] ZODIACAL STARS for the Epochs 1900 and 1920, 

 reduced to an Absolute System, 4to. hf. roan, cl. sides, 5s Qd Washington, 1905 



9087 HEEB (Oswald, Director des Botanischen Gartens, Zurich) Die URWELT der SCIIWEIZ ; with 

 geological map, and 17 plates of Primaeval Natural History, etc., and woodcuts, roy. 8vo. hf. calf 

 gilt, by Riviere, as good as new, 10s Qd Zurich, 1865 



9088 _ The PRIMEVAL WORLD of SWITZERLAND, edited by JAMES HEYWOOD, F.R.S., with fold- 

 ing coloured map, 18 plates, and 372 woodcuts, 2 vols. 8vo. cl., 10s (p. 1. 8s) 1876 



The author reconstructed the flora of the Tertiary Period, and by comparing it with that of the present time, deduced 

 the climate of the primeval world. 



9089 HEIGHWEY (William) The HANDBOOK of PHOTOGRAPHIC TERMS, cr. 8vo. sewn, Is Qd 1 880, or, '4 



9090 - PHOTOGRAPHIC PRINTER'S ASSISTANT, 12mo. sewn, 2s 1879 



9091 HEINEN (Franz) Uber einige ROTATIONS- APPARATE, inbesondere den Fessel'schen ; with 

 28 woodcuts, 8vo. sewn, 2s Braunschweig, 1857 



9092 HELE-SHAW (Henry Selby, F.R.S.), and Alfred HAY : LINES of INDUCTION in a 

 MAGNETIC FIELD, with 8 plates and 8 woodcuts, roy. 4to. sewn, 2s Qd 1900 



9093 HELL (Peter) Die WICHTIGSTEN KLEIN-KRAFT-MASCHINEN, ihre Vorziige und ihre Mangel ; 

 with 16 woodcuts, 8vo. sewn, Is Qd Braunschweig, 1878 



9094 HELLINS (John, pr. ; F.R.S.) DR. HALLEY'S QUADRATURE of the CIRCLE improved : a Trans- 

 formation of his Series to others which converge by the Powers of 80, 4to. (pp. 6), sewn, 2s Qd 1794 



9095 - Mr. JONES, COMPUTATION of the HYPERBOLIC LOGARITHM of 10 IMPROVED : a Trans- 

 formation of the Series which he used in that Computation to others which converge by the 

 Powers of 80, with Postscript, containing an Improvement of MR. EMERSON'S Computation of the 

 same Logarithm, 4to. (pp. 7), sewn, 3s Qd 1796 



9096 - MATHEMATICAL ESSAYS on Several Subjects : containing NEW IMPROVEMENTS and 

 DISCOVERIES in the Mathematics, with diagrams, 4to. sewn (rare), 12s Qd 1788 



Comprising the following important papers, originally published in the ' Philosophical Transactions ', and now revised 



and enlarged : On the Computation of Logarithms : On the Reduction of Equations having two equal Roots : On the 

 Correction of Fluents found by Descending Series : On the Transformation of certain Series to others of Swifter Conver- 

 gency (for which the author received the Royal Society's Copley medal) : On the Force of oscillating Bodies on their Centers 

 of Suspension. 



9097 HELLMAN (Gustav ; Director Prussian Meteorological Inst.) REPERTORIUM der DEUTSCHEN 

 METEOROLOGIE : Leistungen der Deutschen in Schriften, Erfindungen und Beobachtungen auf 

 dem Gebiete der Meteorologie und des Erdmagnetismus, von den altesten Zeiten bis 1881 ; with 

 plate and folding map, large 8vo. (pp. 1017), hf. cl., 10s (p. M. 15.60) Leipzig, 1883 



An excellent bibliography of German meteorology, uniform with Poggendorff s ' Handworterbuch ', to which it should 

 be added as a supplement. , 



9098 HELLOT (Jean ; F.R.S.) L'ART de la TEINTURE des LAINES et des Etoffes de LAINE, en Grand 

 ou Petit Teint, avec une Instruction sur les Debouillis, premiere edition, 12mo. old calf gilt 

 (RARE), 1. 5s , 1750 



9099 - NOUVELLE EDITION, 12mo. contemporary boards, 15s Didotfils, 1786 



Important as the first work which created a scientific basis for the art of dyeing. 



9100 - , Pierre Joseph MACaUEB, and LE PILEUB d'APLIGNY: The ART of 

 DYING [sic] WOOL, SILK, and COTTON, translated from the French, with Q copperplates, 8vo. calf 

 neat, with auto, of Sir Thomas Wardle on title (RARE), 1. 10s 1789 



9101 HELLYEB (S. Stevens) LECTURES on the SCIENCE and ART of SANITARY PLUMBING, with 

 130 woodcuts, fcap. 8vo. hf. morocco, 2s [1882] 



9102 - The PLUMBER and SANITARY HOUSES : a Practical Treatise on the Principles of Internal 

 Plumbing Work or the Best Means for effectually excluding Noxious Gases from our Houses, 

 3rd Edition [wholly rewritten and enlarged], with 28 plates (many folding and linen-mounted) , 

 and 262 woodcuts, roy. 8vo. hf. morocco, 4s [1884] 



9103 - FOURTH EDITION [with Appendix] , with 28 plates (many folding), and 284 woodcuts, 

 8vo. cl., 4s Qd (p. 10s Qd) [1887] 



' The best treatise existing on practical plumbing.' The Builder. 



9104 HELMERT (Friedrich Robert ; Univ. Berlin) Die AUSGLEICHUNGSRECHNUNG nach der 

 METHODS der KLEINSTEN QUADRATE, mit Anwendungen auf die Geodasie und die Theorie der 

 Messinstrumente ; with diagrams, 8vo. cl., 3s Qd (p. M. 1) Leipzig, 1872 



9105 HELMONT (Franqois Mercure Baron van) PARADOXAL DISCOURSES, concerning tho 

 MACROCOSM and MICROCOS M, or the Greater and Lesser World, and their Union, set down in 

 Writing by J. B. and now published, with 2 plates, sm. 8vo. calf, with Dr. Brushfield's bookplate 

 (rare), 15s 1685 



9106 - ANOTHER COPY, old calf, neatly repacked, with bookplate of Edward 9th Duke of 

 Norfolk, E. M. (nice copy), 16s Qd 



The author believes that gold is made out of red and white arsenic, and after being killed by the arsenic, is made alive 

 again to bring forth other creatures, as vegetables and animals, ' from whence we may conclude that Gold is not onely in 

 the Earth for to be digged thence, and made into Coin and Plate '. There is an appendix on the education of children. 



9107 HELWIG (Paul Iwan) Eine THEORIE des SCHONEN : MATHEMATISCH-PSYCHOLOGISCHE 

 STUDIE, 8vo. boards, 2s Amsterdam, 1897 



