54 



REPORTS, ETC. INDEX OF SUBJECTS. 



Maecenas, colcesal bust of, presented by Dr. 

 Manni, 1837, xliii. 



Maenidaj of the China and Japan seas, Sir 

 J. Richardson on the, 1845, 239. 



-- — of North America, Sir J. Richardson 

 on the, 1836, 206, 210. 



Magnesia, sulphate of, and chloride of 

 barium, Dr. T. Andrews on the heat of 

 combination of, 1849, 71. 



, sulphate of, and nitrate of barytes, 

 heat of combination of, 1849, 72. 



— — , sulphate of, and acetate of lead, heat 

 of combination of, 1849, 73. 



Magnesian conglomerate from Downhill, 

 Co. Londonderry, A. Gages on the che- 

 mical examination of the, 1859, 69. 



Magnet, powerful temporary, 1831-32, 85. 



Magnetic force, terrestrial, S. H. Christie 

 on the, 1833, 118. 



■ and meteorological observations, re- 



port for procuring a continuance of the, 

 1858, 295. 



disturbance, remarkable, at Toronto, 



1841, 340 ; remarks on the, 345 ; also 

 observations of the same disturbance at 

 Trevandrum, St. Helena, and the Cape 

 of Grood Hope, by General Sabine, 347, 



349» 351- 



disturbances, on, 1842, 6. 



force in Ireland, on the direction and 



intensity of the, by Rev. Dr. Lloyd, General 



Sabine, and Admiral Sir J. C. Ross, 1835, 



117:— 



1. Horizontal intensity, 117. 



2. Dip and intensity, 137. 



3. Isodynamic and isoclinal lines, 150. 

 force, in Scotland, General Sabine 



on the direction and intensity of, 1836, 



97*— 



Observations of dip, 97. 

 Intensity : — 



By Prof. Lloyd's statical method, 105. 

 By the method of horizontal varia- 

 tions, no. 



intensity of the earth's surface, report 



on the variations of the, by General Sa- 

 bine, 1837, I. — I. Historical notices : — 

 Rossel, 3 ; Humboldt, 5 ; Humboldt 

 and Gay-Lussac, 7 ; Sabine, 8, u, 

 19, 33; Hansteen, 10; Erichsen, 

 1 1 ; Boeck, 1 1 ; Liitke, 1 3 ; Lenz, 1 3 ; 

 King, 15 ; Keilhau, 11,22 ; Hansteen 

 and Due, 2 3 ; Erman, 11,23; Kupffer, 

 25 ; Quetelet, 26 ; Douglas, 27 ; Fitz- 

 Roy, 32; Rudberg, 33; Lloyd, 33; 

 Ross, 33; Estcourt, 35; Freycinet, 

 35 ; Forbes, 41 ; Duperrey, 1838, 

 318; Bache, 1838, 319. 



II. General Table of Intensities, 1837, 42. 



III. General conclusions, 63. 

 Appendix, 497 : Errata, 500. 

 Appendix, 1838, 318. 



instruments : — transportable magneto- 

 meter, Prof. Lloyd's inclinometer, Weber's 

 inductive inclinometer, Lamout's inclino- 

 meter, 1842, 8, 9. 



Magnetic needle, General Sabine on the 

 diurnal variation of the, in different 

 months of the year, 1854, 357. 



and meteorological observatory at To- 

 ronto, report of the committee on the ex- 

 pediency of continuing the, 1848, 99. 



observatory at Philadelphia, Mr. Bache 



on the, 1842, 209. 



observatories, British Colonial, on some 



of the results obtained at the, by General 

 Sabine, 1854, 355. 



and meteorological observatories, re- 

 port of the joint committee of the Royal 

 Society and the British Association for 

 the continuance of, 1858, 295. 



surveys, 1838, 49; 1841, 40; 1842, 



4 ; 1843, 59 ; 1844, 147 ; 1845, 3 ; 1857, 

 130; 1859, 167. 



— — — survey of Great Britain, memoir 

 on the, by General Sabine, 1838, 49- 

 196 : — 

 Introduction, 49. 



Division I. Dip. 

 Errorsof dipping-needles, and improve- 

 ments, 51. 

 Annual alteration of the dip, 62. 

 Dip in London (May 1838), 64. 

 Sect. 1. Observations in England, 67. 

 Sect. 2. Observations in Scotland, 86. 

 Sect 3. Observations in Ireland (by 



Rev. Dr. Lloyd), 91. 

 Summary and deduction of the iso- 

 clinal lines, 120. 

 General table of the dip observations. 



Division II. Intensity. 

 Sect. 1. Observations in England : — sta- 

 tical method, 138; method of hori- 

 zontal vibrations, 148. 

 Sect. 2. Observations in Scotland : — sta- 

 tical method, 155 ; method of hori- 

 zontal vibrations, 161. 

 Sect. 3. Observations in Ireland (by Rev. 

 Dr. Lloyd) : — method of horizontal 

 vibrations, 165 ; statical method, 176. 

 Summary and deduction of the isody- 

 namic lines, 186. 

 General table of the intensity observa- 

 tions, by the statical method, 190. 

 Extension of the isoclinal and isody- 

 namic lines into meridians east and 

 west of the British Islands, 193. 



survey of Great Britain, report of 



the committee on the, 1857, 130; 1858, 

 185. 



survey of Ireland, Rev. Dr. H. Lloyd 



on the instruments employed in the, 1858, 

 260. 



survey of Scotland, by J. Welsh, on 



some results of the, by B. Stewart, 1859, 

 167 : — 

 Div. I. Dip, 167. 

 Div. II. Total force, 175. 

 Div. III. Declination, 183. 

 Magnetical and meteorological observations, 

 simultaneous, report on a series of resolu- 



