vi CONTENTS, 
Dr. Grapstoner and Rey. T. P. Dare on some Optical Properties of Phos- 
PDOTUS ......2eeceseeeeessncenececerceeereceeenes eonewammsieeseefspsmscensans Seed esteee aeeere 
Mr. F. Garton a Hand Heliostat, for the purpose of flashing Sun Signals, 
from on board Ship or on Land, in Sunny Climates .s dccessecesscaecaeeeeeeeees 
Dr. J. H. Guapstone on the Fixed Lines of the Solar Spectrum .....s..++s...+++ 
Rev. W. R. Grove on the Infiuence of Light on Polarized Electrodes............ 
Mr. W. M‘Craw on a New, Cheap, and Permanent Process in Photography. 
(Communicated by Sir Davip BREWSTER.) ...+++++er eee Ppeeaocococn i cohactaes 
Sir G. RoBINSON On Moon Blindness ...cccscsecesssceresccecccnescssecensesssecenssnces 
Mr. SamveEt, an early form of the Lenticular Stereoscope constructed for 
the use of Schools, exhibited by .......sseesecsseereeeee Sse sce cu usetey eae euse sane eee 
Mr. Norman Pogson on the Ocular Crystal Micrometer, with observations of 
twelve double stars, as evidence of its extraordinary power in measuring 
small angular distances. (Communicated by Dr. JoHN LEE.),........+0+00 ae 
Dr. F. A. S1nsestTROM on the Distribution of Heat in the Interior of the Earth 
Mr. B. Srewart’s Account of some Experiments on Radiant Heat, involving 
an Extension of Prevost’s Theory of Exchanges .............ss0+8 veccsesecvescccces 
Execrricity, MAGNETISM. 
Mr. J. Drummonp on the Intensity of the Terrestrial Magnetic Force........ a 
—— on the Development of a Physical Theory of Terrestrial 
Magnetism, an outline of which was submitted to the Dublin Mecting........ 
Mr. C. L. Draper’s Memoir on Electro-Magnetism............ qanneaaancennextewery 
Mr. WitpMan WHITEHOUSE’s contributions on the Submarine Telegraph..... 
Mr. J. P. Gassior on Induced Electrical Discharges taken in Aqueous Vapour 
—— on the Phosphorescent Appearance of Electrical Discharges 
in a Vacuum made in Flint and Potash Glass 
Mr. Georcs Gorr’s exhibiton of Apparatus showing the Correlation of Forces, 
and Exhibition of Heating Effects, by Mechanical Operations, on a peculiar 
Form of Antimony .......... aqceccacks sous se onassce as aeeteemaee sescescerereeeecoen 
Mr. W. Lapp on an Improved Induction Coil...,.... 
Dr. F, A. StnsestROM on the Magnetic Dip at Stockholm,........cescesessccenseee 
ASTRONOMY. 
Mr. Epwarp JosHua Cooper on the Perihelia and Ascending Nodes of the 
Planets ......+...++- Bisse bheie=seeatcs gs guesearen ba sadooedsrengepesbiocsseasens tidelepscagaxgpe 
Donati’s Comet.—Extracts from Letters received by Mr. E. J. Coopzr, from 
Mr. A. GraHAm...... mastoseasiaanns as 
Peete ee ses ccessseesses BOOP eee tere see eeeseeeseres 
Dr. Jonn Lee on the Results of the Measures of Gamma Virginis for the Epoch 
1858, as determined by Admiral Smyrn ...... sgobt even seae vege sesessedeesncsteneeee 
Mr. N. Pocson on a New Variable Star (R. Sagittarii), discovered with the 
5-foot Smythian Telescope of the Hartwell House Observatory. (Commu- 
nicated by Dr. JoHN LEE.) ........c.ccceeceee seen cbcecaitonco kboeone Oe ee 
Dr. F. A. StrsestR6M on the Constitution of Comets ..... egcdanieanerades soca 4 
Page 
29 
30 
Colonel SyKes on the successful establishment, by Astronomer Brown, of a ' 
Meteorological and Magnetical Observatory at Travancore, at 6200 feet above 
the Level of the Sea; with Results of Magnetical Observations at Trevan- 
drum, as communicated in a Letter from Mr. Broun to General Sir Toomas 
BSHISBANE, .cccuccescesberrsersees asaages® spsvaseaduatoes ' 
Pater erenee teenee Pee ceretserareeere 
