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



8970 HARRISON (John, ' Longitude Harrison') : Maskelyne (Nevil, pr., F.R.S., Astronomer Royal) 

 Account of the Going of Mr. John Harrison's Watch, at the Royal Observatory, from 

 May 6th, 1766, to March 4th, 1767, with the Original Observations and Calculations of the same, 

 published by Order of the Commissioners of Longitude, 4to. (pp. 84), sewn (rare), lis Qd 1767 



This work forms perhaps the best testimonial, against the attacks of Harrison and Mudge, to the scrupulous fairness of 

 the Astronomer Royal in testing the new chronometers ; though, as mentioned above, Harrison was kept out of the 

 covenanted reward as long as possible for reasons which some have imputed to Dr. Maskelyne. The conditions under 

 which they were examined agree on the whole with the Kew rules of the present day. 



An appendix contains ' Observations of Equal Altitudes of the Sun taken at Portsmouth, Jamaica, and Barbadoes, 

 according to the Time of Mr. Harrison's Watch.' 



8971 HARRISON (Williani Jerome, f.g.s.) Geology of the Counties of England and of North 

 and South Wales, ivith 106 woodcuts, 8vo. cL, 4s (p. 85) 1882 



8972 Text- Book of Geology : intended as an Introduction to the Study of the Rocks and their 



Contents, with 140 woodcuts, cr. 8vo. cl., '2s 1897 



8973 HARTIG (Ernst) Die Dampfkessel-Explosionen ; with 2 folding plates, 8vo. (pp. 39), sewn. 

 Is 6d Leipzig, 1867 



8974 HARTLEY (David, MP. ; Jriend of Benjamin Franklin) ACCOUNT of the Invention and Use 

 of Fire Plates, for the Security of Buildings and Ships against Fire, with etched front, 8vo. 

 (pp. 32), sewn (scarce), 7s Qd 1834 



The invention consisted of the placing of thin iron planks under the floors and attaching them to the ceilings to 

 prevent an immediate access of the fire, and to stop the air current and free supply of fuel. 



8975 HARTLEY (Sir Walter Noel, f.r.s.) Course of Quantitative Analysis for Students, with 

 woodcuts, cr. 8vo. cl. (o.p.), 3s 6d 1887 



8976 On the Optical Properties of a New Chromic Oxalate, 8vo. (pp. 9), sewn, with 



author's inscr., 2s 1873 



8977 HARTMANN (Carl Friedrich. Alexander) Handbuch der Mineralogie zum Gebrauch fiir 

 Jedermann ; with 30 folding plates, and numerous woodcuts, 2 thick vols. 8vo. boards (scarce), lOs 



Weimar, 1843 



8978 HARTMANN (Eduard v.) Die Weltanschauung der modernen Physik, roy. 8vo. sewn, 

 3s 6d (p. M. 6.50) Leipzig, 1902 



8979 HARTMANN ( Johann ; Univ. Marburg) Praxis Chymiatrica, edita k Johanne Michaelis, 

 nova Editio : adjectisuntTRES Tractatus Novi, 16rao. (pp. 360), old sheep (rare), I5s Genevce, 1647 



8980 Another Copy, contemporary vellum, I65 



This edition contains three new treatises : I. De Oleis variis Chymice distilatis. II. Basilica Antimonii Homeri Poppii 

 Thallini. III. Marci Cornacchini D.M. Methodus, qua omnes affectiones . . . Chymice et Galenice curantur. 



8981 Editio Nova, recognita et emendata prae omnibus hactenus Editionibus [cum Pr?efatione 



JOHANNIS Antonidis VAN DER LiNDEN] , 18mo. nice copy in vellum, 10s Lugd. Batavorum, 1663 



This edition does not contain the three treatises included in that of 1647. 



• C'est le plus important des ouvrages de Hartmann.'— Biogr. Gen. The author was the first professor of chemistry in 

 any University. 



8982 HARTSOEKER (Nicolas) Conjectures Physiques; with vignettes, map, and numerous 

 diagrams : Eclaircissemens sur les Conjectures Physiques ; with diagrams — 2 vols. 4to. in 1, 

 old calf gilt (rare), \2s ' Amsterdam, IIOQ-IO 



*Ses Eclaircissements sont des reponses a des objections dont la plupart etaient de L3ibnitz. 11 y censure aussi 

 severement les volumes publies par I'Acadetnie de Paris, disant qu'il ne critiquait que ce qu'il estitnait.'— -Biogfr. Gen . 

 The author is perhaps best known for his improvements in the microscope and telescope. 



8983 [HARVEY (George, f.r.s.)] Meteorology (Encyclopaedia Metropolitana), with 16 plates, 4to. 

 unbound (wanting pp. 89-96, and 1 plate), 2s [1833] 



8984 [ ] Naval Architecture (Encyclopaedia Metropolitana), with 6 steel plates, 4to. unbound, 



3s J f f J j-jgg^-j 



8985 On a Remaekable Case of Magnetic Intensity of a Chronometer, 4to. (pp. 10), 



sewn, with author's inscr., 3s Edin., 1823 



8986 Results of Experiments relating to Comparative Means of Defence afforded by 



Ships of War having Square and Curvilineal Sterns, with 2 folding plates by Basire, 8vo. 

 hf calf gilt (scarce), 12^ 6d 1824 



'To the Right Honble. the Earl of Morley, with the Author's respectful Compliments.'— r/iscr. on title. 

 The above work is not noticed by Lowndes and Allibone, and is scarce. There is no copy of it in the Library of the 

 Institution of Naval Architects. 



8987 HARVEY (Gideon, m.d, ; physician to Charles II.) Archeologia Philosophica Nova, or 

 New Principles of Philosophy, containing Philosophy in general ; Metaphysicks, or Ontology ; 

 Dynamilogy, or a Discourse of Power ; Religio Philosophi, or Natural Theology ; Physicks, or 

 Natural Philosophy, with fine folding portrait by P. Philippe, and engravings on copper and 

 wood, sm. 4to. contemporary English calf, one Joint neatly mended (fine copy), 15s <S^. Thomson, 1663 



The Natural Philosophy fills 439 pp. of the work, and includes chapters on light, colours, sound, the loadstone, and 

 many others of meteorological or astronomical interest. 



8988 HARZER (Paul; Univ. Kiel) Astronomische Beobachtungen auf der Stern warte der 

 Universitat zu Kiel, I. Beschreibung der neuen Meridiankreisanlage ; with 6 autotype 

 plates, roy. 4to. sewn, 6s Leipzig, 1905 



8989 Ueber die Bestimmung und Verbesserung der Bahnen von Himmelskorpern nach 



drei Beobachtungen, 4to. seum, 5s ib., 1901 



8990 Ueber die geometrische Methode zur Bestimmung der Bahnen von Himmelskorpern 



nach fUnf Beobachtungen, 4to. sewn, 5s ib-, 1910 



8991 Untersuchungen iiber einen speciellen Fall des Problems der drei Korper ; with 



plate, roy. 4to. sewn, 4s St. -Petersbourg, 1886 



8992 Ueber die Zeitbestimmung im Verticale des Polsternes, 4to. sewn, 3s M 



Leipzig, 1899 



