iv 
CONTENTS. 
Sir William Snow Harris on some recent and remarkable examples of the 
rrotection afforded by Metallic Conductors against heavy strokes of lightniog S 
*~ 7 r ; -’s Observations on the general Nature and Laws 
lilyctncal Attraction . y 
Letter from Dr. l.amont to Colonel Sabine.... . - 
Mr. Harpeu 00 Galvanic Connexion . .. .. * 
Sir Gratbs C. Hauguton’s Pniofs of the Antagonism of Heat and Elcctpdty: 
and also of the Singleness of the Electric Fluid; with some Remarks oa tlw 
Nature of Conduction and Induction . f 
Mr. A. B. Orlgbar on the Magnetic and Moteorologic Observatory at Boiobif • 
Mr. F. Ronalds' Notice of Observations carried on at the Kew Observatory- * 
Rev. W. ScoRBsnv on the Defects of and Danger arising from the Use of Cor» 
rective Magnets for Local Attraction on the Compasses of Iron-built Vessel* 1 
Dr. James Apjokn on the Composition and Optical Properties of avarietyof 
/fyahVe from Mexico .. . . . f. . 
Sir David Brewster on the Polarization of the Atmosphere.. " 
on a Ncr" Species of Polarization related to the directioB 
of the Grooves in Grooved Surfaces. .... ... '' 
on the Conversion of Relief in a drawing, by inverting 
the Drawing and viewing it witli a lens of a short focus 
on the Diffraction Bamla produced by the eilgcs of This 
Plates, whether Solid or Fluid. 
on the Dark Lines in the Portion of the Red Spaw he* 
youd the Bed Extremity of the Spectrum as seen by FruunlioiVr 
•’s Account of the Functions of the Membranes oftheEy' 
at the Foramen Centralc of Sucintnering... . ^ 
Mr. J. R. Crowe's Meteorological Observations at Christiania in tbeyefU’lS'l® 
M. Clavdet ou different properties of the Solar Radiation in producing oi'l’f*' 
venttng r depoBit of Mercury on Silver Plates coated with Iodine or its 
paunils,with Chlorine and Bromine, modified by coloured glass media an 
vapours of the atmosphere. y 
Mr. Dale oa u proposed Optical Experiment.’ 
IWessor C. P. Smyth on Changes In the Position of the Transit-iusbiJ"'®' ^ 
attributed to the Temperature of the Earth. j: 
Professor Powell on Anomalies in the Dispersion of Light . -. 
Professor Thomson on the Electric Currents by which the Phamomena of i<f* 
restrlol Magnetism may be produced..... .. 
extraordinary Mirage witnessed at Birkenhead 
CTieshire ... jy 
Prof. A. Bacub’s Map of the Coast Survey of the United States. 
Mr.C. BunoKBon the Results obtained by Automatic Registration of the ^ 
nometcr ........ 
Capt. CocKBDR.v on Anemometers and Resolving Scales. ‘I’ 
IVofeasor J. D. Forbes'O bservations on the Temperature of the Earth at 
vandrum, from the Observations of John Caldecott, Esq... 
Mr. G. A. Rowell on the Cause of the Aurora, and the Declination of 
Needle . . 
- -on the Cause of Evaporation, Rain, Hailstones, and 
Winils of temprjate regions... il 
Captain Shortredb on a Chart of the Dew-Point. . 
General Ccllen’s Baroroctrical Levelings in the Madras Presidency, 
Observations by Lt.-Coloae1 Sykes...... . 
Ulrich’s Improvements in Chronometers, 
p " ert method of producing and applying very fine Wire of Gold or Pl iJ 
for Astronomical or other purpose^....,.. . .. .. 
