478 HENBY SOTHERAN & CO., 140, STRAND, W.C., AND 43, PICCADILLY, W. 



9500 HOUSTON (Edwin James) DICTIONARY of ELECTRICAL WORDS, TERMS, and PHRASES, 

 illustrated, sq. cr. 8vo. (pp. 656), cl., 2s Qd (p. 10s Qd) New York, 1889 



9501 , and Arthur Edwin KENNELLY : ELECTRO-DYNAMIC MACHINERY for CONTINUOUS 



CURRENTS, with 232 illustrations, 8vo. cl., 4s (p. 10s Qd nett) ibidem, 1899 



9502 HOVENDEN (Frederick, F.L.S.) A STUDY of the PRINCIPLES of NATURE, with 51 plates and 

 other illustrations, 8vo. cl., 3s (p. 6*) 1909 



9503 WHAT is HEAT ? a Peep into Nature's most Hidden Secrets, with 94 woodcuts, 8vo. cl., 5s 



(p. 15s) 1894 



9504 WHAT is LIFE ? or where are we ? what are we ? whence did we come ? and whither do 



we go? 3rd Edition, with Appendix, illustrated, 8vo. cl., 3s (p. 6s) 1909 



9505 HOW (Henry ; King's Coll., Windsor, Nova Scotia) On the ACTION of HALOGEN COMPOUNDS 

 of ETHYL and AMYL on some VEGETABLE ALKALOIDS, 4to. (pp. 22), sewn, with inscr. to Sir E. 

 Frankland, F.R.S., 3s Edin., 1854 



9506 On the OCCURRENCE of NATRO-BORO-CALCITE with GLAUBER SALT in the GYPSUM of 



NOVA SCOTIA, 8vo. (pp. 8), sewn, Is Qd ib., 1857 



9507 [HOWARD (Hon. Edward)] REMARKS on the NEW PHILOSOPHY of DES-CARTES, done 

 by a GENTLEMAN, 4to. old calf gilt, 4s 1700 



Lucky Descartes, to be noticed by a gentleman ! 



9508 HOWARD (John) TREATISE on SPHERICAL GEOMETRY, containing its Fundamental 

 Properties ; the Doctrine of its Loci ; the MAXIMA and MINIMA of SPHERICAL LINES and AREAS : 

 with Application, 7 folding plates, 8vo. hf. calf (rare), 12s Qd Newcastle-on-Tyne, 1798 



The author was son of a private soldier in Fort George, and was a self-taught mathematician, while working as a cork- 

 cutter, carpenter, and flax-dresser. 



' His reputation as a mathematician rests mainly on the ' Treatise on Spherical Geometry.' When discussing some loci 

 of spherical angles and triangles, and certain lines drawn on spherical and cylindrical surfaces, the author notes many 

 analogies between the properties of lines meeting on the surface of the sphere and those drawn to meet a plane 

 circle. 1 D. N. B. 



9509 HOWARD (John Eliot, F.R.S. ; quinologist) EXAMINATION of the BELFAST ADDRESS of the 

 BRITISH ASSOCIATION, 1874, from a Scientific Point of View, 8vo. sewn, Is Qd 1875 



Directed against Prof. Tyndall (v. No. 4971, ante). 



9510 HOWARD (Luke, F.R.S. ; friend of Goethe and John Dalton) The CLIMATE of LONDON, 

 deduced from Meteorological Observations made at different Places in the Neighbourhood of the 

 Metropolis, first edition, with Q plates (2 folding), and woodcuts, 2 vols. 8vo. boards, uncut 

 (SCARCE), 10s Qd 1818-20 



9511 ANOTHER COPY, boards, uncut, with inscr. ' To Josiah Foster with the Author's kind 



Regard. Fifth Month 31. 1818 ' on title, 12s 



9512 SECOND [LAST] EDITION, much enlarged and improved, in which the Observations are 



continued to 1830, with 9 plates (2 folding), and numerous woodcuts, 2 vols. 8vo. cl. (SCARCE), 

 MsU 1833 



' In 1806 Howard began to keep a meteorological register, and published the result of his observations in his ' Climate of 

 London '. His instruments were, from a modern point of view, rude and insufficient ; but for the early years of the 

 century his are almost the only observations that have been preserved.' D. N. B. 



9513 A CYCLE of EIGHTEEN YEARS in the SEASONS of GT. BRITAIN; deduced from Meteoro- 

 logical Observations at Ackworth, Yorks., 1824-41 ; compared with others before made for a like 

 Period (ending with 1823) in the Vicinity of London, with 5 plates, 8vo. cl., 5s Qd 1842 



An elaboration of the author's theory, first mentioned in his ' Climate of London ', in 1818, of ' alternate periods of 7 and 

 10 years, the former ascending, the latter descending in the scale of heat.' It was Giuseppe Toaldo (v. A T os. 4868-9, ante) 

 who first suggested the 18 years' cycle. 



9514 ESSAY on the MODIFICATIONS of CLOUDS, 8vo. cl. (scarce), Qs Qd 1832 



' This essay gave him a scientific fame. It applies the methods of Linnseus to the varying forms of the clouds. The 

 author defines their three chief modifications, which he names Cirrus, Cumulus, and Stratus, and four intermediate or com- 

 pound modifications, the best known of which is the Nimbus or rain-cloud. These names have been generally adopted by 

 meteorologists '. Thomas Hodgkin, D.C.L. 



9515 PAPERS on METEOROLOGY, relating especially to the CLIMATE of BRITAIN, and to the 



VARIATIONS of the BAROMETER, with 9 charts, 2 parts in 1 vol. roy. 4to. cl., Is Qd 1854-50 



9516 SEVEN LECTURES on METEOROLOGY ; 2nd Edition, carefully revised by the Author, with 



woodcuts, fcap. 8vo. cl., uncut, with author's inscr., 5s 1843 



9517 HOWE (Herbert Alonzo ; Chamberlin Observatory, Denver, Colo.) THREE APPROXIMATE 

 SOLUTIONS of KEPLER'S PROBLEM, 8vo. (pp. 6), sewn, Is Qd s. I. aut a. 



9518 HOWE (Henry Marion, Columbia Univ.) The METALLURGY of STEEL, VOLUME I (all 

 published) ; 2nd Edition, enlarged, with 2 folding plates, and 230 other illustrations, folio, cl. 

 (o. p.), 1. 10s (p. 2. 2s nett) New York [1904] 



'This is the recognized standard authority on the metallurgy of the Bessemer and crucible steel processes, and upon the 

 properties of steel as far as they were known and understood at the time when this book was written. It will long remain 

 a classic. 'B. Stoughton. 



9519 HOWLETT (Samuel Burt) DIRECTIONS for using ANEROID and MERCURIAL BAROMETERS in 

 determining ALTITUDES, with Table and Examples, front., fcap. 8vo. (pp. 15), sewn, 2s Qd 1859 



1 He made improvements in the mountain barometer, and also invented an anemometer. 1 D. N. B. 



9520 HOW ORTH (Sir Henry Hoyle; F.R.S.; Conservative politician; 'Quarterly' reviewer; 

 historian of the Mongols) The GLACIAL NIGHTMARE and the FLOOD : a Second Appeal to Common 

 Sense from the Extravagance of some recent Geology, 2 vols. 8vo. cl., 8s Qd (p. 1. 10s) 1893 



9521 HOYER (Egbert v. , Munich) LEHRBUCH der vergleichenden MECHANISCHEN TECHNOLOGIE ; 

 with 4 plates and 561 woodcuts, large 8vo. hf. brown morocco, 3s Qd (p. M. 20 sewn) 



Wiesbaden, 1878 



9522 HUBERT (Herman) UTILISATION DIRECTE des GAZ de HAUTS-FOURNEAUX pour la Production 

 de la Force Motrice, 8vo. (pp. 57), sewn, Is Qd St.-Mienne, 1900 



