CONTENTS. 
—_———_ 
NOTICES AND ABSTRACTS OF MISCELLANEOUS 
COMMUNICATIONS TO THE SECTIONS. 
MATHEMATICS AND PHYSICS. 
’ Dr. Forses on the mean Apsidal Angle of the Moon’s Orbit ............ 
Professor NicHox’s Account of the Observatory erecting near Glasgow 
Professor Arry on a New Apparent Polarity of Light ..................00. 
Sir Davip BrewsTER on Professor Powell’s Measures of the Indices 
of Refraction for the lines G and H in the Spectrum ..............00008 
——_—— on the Decomposition of Glass .............esee0ees 
on the Rings of Polarized Light pee in 
specimens of Decomposed Glass .........:sesessscnssteseeetersueceesseusceas 
on the Cause of the Increase of Colour ‘by the 
Mawersion) ofthe sead fot kas asics Soeaw cn oomands Seandeenan Datileiniinneeerens 
on the Phenomena and Cause of Muscz Volitantes 
on the Line of Visible Direction along the Axis of 
on the Camera Obscura, and other Apparatus, 
used in making Daguerreotype Drawings ...........sccecscsssscscseeseees 
——— — Ona Method of Illuminating Microscopic Objects 
On an Improvement in the Polarizing Microscope 
Col. Rerp’s Letter to Sir David Brewster ..........cececsssssceeesersesescees 
Mr. Bowman on a remarkable Rainbow  .........csessssecsevsescsccesedaces 
Rey. J. FisHer on remarkable Rainbows .........ssecscecscsceceeecsesescees 
Mr. A. Bexu on a new case of Interference ........sssccscsecsercevecscesecs 
Dr. JosepH RAD on the Iriscope .............sssececesscscececessvesessseees 
Professor Powe. on an Experiment of Interference ...............0ee008 
on a point in the Wave-Theory as applied to Heat. 
Professor KELLAND on the Conduction of Heat ............csceeesesseeees 
Mr. Eaton Hopexrnson on the Temperature of the Earth in the deep 
Mines in the neighbourhood of Manchester ............sscecsececececeeee 
Professor Jacoz1 on the Principles of Electro-Magnetical Machines ... 
Mr. C. J. Kennepy on the Theory of Electricity ...............scceceeesees 
Dr. Lamont’s Account of the Magnetic Observatory of Munich ...... 
on a general statement of the System of Meteorological 
Observations carried on in Bavaria .........scscececscesscncscecstececececees 
Mr. Caupecort’s Notice accompanying a Series of Meteorological Ob- 
servations made at Trevandrum ........ssecsseececscesescececenseasececsaens 
Dr. ANDERSON on the Dew-Poinit ............ccscecssvescesccecccevccessessces 
Mr. Granam Hurcuinson on a Method of Prognosticating the proba- 
ble mean Temperature of the several Winter Months from that of cor- 
responding Months in the preceding Summer ............ Sevesslcesasaes 
Professor Forses on Excessive Falls of Rain..... en eeeans dakirataane. oueese 
Mr. Joun Puiiuips’s new Experimental Researches on Rain... eek eteeteer 
Mr. G. A. Rowe.t on the Formation of Rain .......... dadvadsaacaceaneees 
—— on the Cause of the Aurora, &.......csscesccessseceees 
