iv CONTENTS. 
Rev. WrixiaMm Scoressy on a large Magnetic Machine .........sssssssseeeseeeees 
Mr. JosepH York Otrver on the Baron de Bode’s Insulated Compass......... 
Mr. E. J. Dent on a Method of suspending a Ship’s Compass......... sadbssdodeas 
Mr. S. M. Saxsy on the Connection between Magnetic Variation with certain 
peculiarities of the Earth’s Structure ........sessesressesseeseeeeenees senda Peet hes ; 
Rey. Taomas Knox on the amount of Rain which had fallen, with the different 
winds, at Toomavara, in the County of Limerick, during five consecutive years 
Mr. Henry Lawson on a Thermometer Stand......cscsscesesscsevececssceccecceccs 
Mr. James Tuomas Gopparp on a neW Anemometer.......+.. cAincenapumcepeese 
Rev. T. Ranxin’s Meteorological Observations made in 1844 at Huggate, Wold, 
Yorkshire, .<ccs.0s Saas eee cree ccavestatkoenoenes An ptt haere SEN ane caupeswceses 
— Additional Thermometrical Observations in a deep well at 
Piugeate cc ccscccccqse ress Sopapste re areas tosis gis ao'saquda tuani'ls sy exbeas cccvescsgageaneces 
Sir Davip Brewster on Fog-rings observed in America.,...cseessseeeeeees cesenes 
Mr. J. R. Crowr’s Tables of Meteorological Observations for the year 1844... 
Mr. J. F. Coxn’s Description of the Lightning and Thunder of the 16th of 
August 1844, which took place at Alten, in Norwegian Lapland ..............- 
M. Covutvier Gravier’s Researches on Shooting Stars.......ssccseseeseeee Beate 
Mr. Ricuarp Epmonps on Remarkable Lunar Periodicities in Earthquakes, 
extraordinary Oscillations of the Sea, and great Atmospherical Changes...... 
Rey. Grorce Fisunr on the Nature and Origin of the Aurora Borealis......... 
Lieut.-Colonel Everest on the Measurement of Two Arcs of the Meridian in 
Indien eae. wes Wis AY Gb. Madsedd Hi zac aaeie er a era ee PAY: devel dvacaneer eine 
Mr. Luxe Howarp on a Lunar Meteorological Cycle ......ccccsssscssescesecenees 
Mr. Eaton Hopexrnson on the Strength of Stone Columns .........cssseeeeeees 
CHEMISTRY. 
M. Boutieny’s Experiments on the Spheroidal State of Bodies, and its Appli- 
cation to Steam-Boilers, and on the Freezing of Water in red-hot Vessels... 
Professor GRAHAM on a New Property of Gases............ ddesse cue sededeegeesecesens 
Dr. Mruier on the Action of Gases on the Prismatic Spectrum ......s..cceeerees 
Mr. Rosrert Hunt’s Contributions to Actino-Chemistry.—On the Chemical 
Changes produced by the Solar Rays, and the Influence of Actinism in dis- 
turbing Electrical Forces ......++++- pases aeeadee visi Meee ee aR 
M. Spiitreersber on the Manufacture of a Coloured Glass...........+0+« dedseeavs 
Professor Grovsz on Recent Experiments on the Gas Voltaic Battery ........+00 
Mr. C. V, WaLker on the Voltaic Reduction of Alloys... .sesessacereerrateseneare 
Mr. W. G. Anmstrona’s Description of a Colossal Hydro-Electric Machine, 
with a Notice of some Phenomena attending the production of Electricity 
Dy Steaks cass; aatesviegh sagrr apes saeashestuerensttveathice AS Fe Gate oo vdadeeeudavabeet 
Mr. James P. Jouxz on the Mechanical Equivalent of Heat......... seeeeeegsenense 
Dr. Lyon Prayrarr on Atomic Volumes ...,. sandthikals 1aas* PPT ithe re 
Mr. Grorce Kemp’s Outlines of a Natural System of Organic Chemistry...... 
Mr. Epwarp Sotty on Gutta Percha, a new yariety of Caoutchouc.......+++++ 
Professor Tuomas TitLey and Dr. Dovexas Maciagan’s Notice of the Oil 
of ASBALECUIGA: cacaccennannnanennnansssameanad@Mniierkslaehansasndid scenes semidn ti eaeaeeee 
Page 
15 
16 
16 
16 
17 
17 
18 
18 
18 
19 
19 
19 
20 
20 
22 
25 
25 
26 
27 
28 
28 
29 
29 
30 
30 
30 
31 
31 
31 
32 
33 
