Vill CONTENTS. 
Mr. J. N. Locxyer’s Preliminary Note on Coggia’s Comet........ Padiote tiie 
—_——_—_——_——-—. on a New Map of the Solar Spectrum 
Colonel Stuart Wort.Ley on Photography in connexion with Astronomy. . 
Puysics. 
Professor T, ANDREWS on Experiments at High Pressures ......0..+0e00es 
Professor W. F. Barrett on the Teaching of Practical Physics ........++ 
Dr. W. B. CARPENTER on the Physical Theory of Undercurrents .......... 
Professor F. GuTHRIE on the Flight of Birds............ccceeeeeeeeeeees 
Mr. G. JoHNsToNE Stoney on the Confirmation of the Nebular Origin of the 
———_—__—_—_——_— on the Physical Units of Nature .............- 
Dr. Vaueuan on Physics of the Internal Harth..............44 re 
Heat. 
Mr. J. Dewar on the Latent Heat of Gases ..... ccc eects ee eee eee tenes 
Professor F. GurHrre on a New Class of Hydrates ...... 00sec ee eeeees 
Professor Joun PursER on the Source from which the Kinetic Hnergy is 
drawn that passes into Heat in the Movement of the Tides............05 
Lieut. 
Mr. P. Brawawm’s further Experiments on Light with Cireularly Ruled Plates 
of Glass..... afer si.c's ib he MOMS Ine: sedate: ecu caste sucha have tera viene ais WG MTN TOre ole eee 
Professor Curtis on Extraordinary Reflection ...........cceese eens Ag die 
Mr, W. Lapp on the Construction of large Nicol’s Prisms .............0+- 
Professor G. G. Sroxrs on the Construction of a perfectly Achromatic Tele- 
RESO saraic apau'a's, "4, 4 46.4.4) 5's ale olare & forouanpt Ae a pehiig oh: rosy +ge15 aca 
Mr. 8. C. TistEy on a Form of Spottiswoode’s Triple Combination of Double- 
Image Prisms and Quartz Plates applied to the ‘Table Polariscope ........ 
—————--— on a New and Simple Form of adjustable Slit for the Spec- 
OSC OPO aiels avec gh' ol ohetaT ota" afl atat eter reloneieveVenaeei Mates @) Cieta aioin 0) aps ceeneeeeeees ve 
ELECTRICITY AND MAGNETISM. 
Dr. W. FuppERsEN on some Peculiarities in the Electric Discharge from a 
OV CONIA 5 reise yo; ace loxerousuerevace.6 ve wera mateaeecnetiae gy a sie ects aetna ee 
Professor G. C. Fostrr’s Geometrical Illustrations of Ohm’s Law.......... 
on Suggestions for a Redetermination of the Absolute 
Electromagnetic Units of Resistance and of Electromotive Force ........ 
Dr, ARTHOR SCHUSTER om Obm' sda wae om kioea teh eres atic iove cremate 
on Unilateral (Conductivity. : 2/5. <9. .4,.. sen ealeanente 
Mr. W. Symons on a New Method of Constructing Carbon-cells and Plates 
for Galvanic Batteries ........0.0s0%es- SROGIEGCO OD DIA OIA Cio sie oe 
— on a New Method for the Electrochemical Decomposition 
of Oils and other Non-conducting Liquids ................ccceucuenees 
on a cheap and convenient Galvanic Battery adapted for weak 
but continuous Currents.......... biobindan POOHICIAHIO Din. gD TAS ocy wey 
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