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CONTENTS. ix 
; Page 
\ Rey. R. Marn, Observed R.A. and N.P.D. of Comet I. 1862 ............ 15 
on the Dimensions and Ellipticity of Mars.................. 15 
Mr. J: NasMyrH on some Peculiar Features in the Structure of the Sun’s Sur- 
BERNE 5S FAY, TANG: YATRA BDO ~ Bales Jere tabtasel RIGA GEER aeRG oabTOg eaters te 16 
Mr. Norman Pocson’s Observations on Three of the Minor Planets in 1860. 
(Communicated: by {Dr} Wisi.) | jo<:5 decease epeyetotalers, Were) ofa faite ofele wren co o's 16 
Mr. W. Oeripy on the Excentricity of the Earth, and the Method of finding 
the Coordinates of its Centre of Gravity ......... ...0005. ange oil mabye 17 
M. J. Scxvanrcz on the probable Origin of the Heliocentric Theory ........ 17 
Rey. Professor Setwyn on Autographs of the Sun. ......... 0. .e cece eee 17 
Mr. W. Sporriswoope on the Hindé Method of Calculating Eclipses ...... 18 
M. C. J. Viti on some Improved Celestial Planispheres ................ 18 
Lieut ann Hear. 
Mr. A. CLavupeErT on the Means of following the Small Divisions of the Scale 
regulating the Distances and Enlargement in the Solar Camera.......... 18 
M. A. Des CriorzEAvx sur la Relation entre les Phénoménes de la Polarisation 
Rotatoire, et les Formes Hémiédres ou Hémimorphes des Cristaux & un ou 
REAP OS) CONAGTOS 5 ieteyshele Porsxayelojae pays dopeheiauelaseabealerald Coin 1 ayeqeie: BS oust ibe 19 
Mr. James Croix on the Cohesion of Gases, and its relations to Carnot’s 
Function and to recent Experiments on the Thermal effects of Elastic Fluids 
ERNE SAE TESIN hades cs n0 ctor Notes thai Arar eMeke as eed ence tay le rahavafac a. eettoycnsca avd eke cvela le 21 
Rey. J. Din@ie on the Supernumerary Bows in the Rainbow.............. 22 
Dr. EssELBAcH on the Duration of Fluorescence .........c0cececeececees 22 
Mr. J. M. Menzies on an Optical Instrument which indicates the Relative 
Change of Position of Two Objects (such as Ships at Sea during Night) 
which are maintaining Independent Courses ............... 0c eee eens 22 
Rey. J. B. ReaprE’s Experiments on Photography with Colour............ 22 
Mr. J. SmirH on the Complementary Spectrum. ............ ccc eeeeeeees 23 
Mr. Cuarites ToMLinson on the Motion of Camphor, &c. towards the Light 28 
Execrricity, MaGnertism. 
Mr. James Croxt on the Mechanical Power of Electro-Magnetism, with spe- 
cial reference to the Theory of Dr. Joule and Dr. Scoresby ............4. 24 
Dr. EssEtBAcH on Electric Cables, with reference to Observations on the 
Minlta- Alexandr, LelopTApli 2 (is toaMs. saa dele File: hs avers slatel ald nde ort 26 
———_———— on an Experimental Determination of the Absolute Quantity 
of Electric Charge on Condensers... 0.0. cei ee ei dee dnce eens cubeuee 27 
Mr. G. M. Guy on an Electromotive Engine ............... 0c sees ee eeaes 27 
METEOROLOGY. 
Mr. Isaac AsHe on Balloon Navigation ........0.: cc cecceseceseeeeeeeees 27 
on some Improvements in the Barometer .............+.. 28 
Mr. Joun Bax on the Determination of Heights by means of the Barometer 28 
Rey. Professor CHALLIS on the Extent of the Harth’s Atmosphere ........ 29 
