. The Rate of Explosion of Hydrogen and Oxygen. By H. B. Drxon, M.A. 905 
. Report of the Committee for constructing and issuing practical Standards 
CONTENTS, 
Page 
for use un Hlectrical’ Measurements ...scesscdes ce. c-euaeeceeoceee: come oeaeee 905 
. Report on Electrical Theories. By Professor J. J. Tomson, M.A., F.R.S. 905 
. On Constant Gravitational Instruments for measuring Electric Currents 
and Potentials. By Professor Sir W. TuHomson, LL.D., F.R.S............. 905. 
. On a method of multiplying Potential from a hundred to several thousand 
Volts. By Professor Sir WitLiam THomson, LL.D., F.R.S. ..........2000 907 
. On a form of Mercury Contact Commutator of Constant Resistance for use 
in adjusting Resistance Coils by Wheatstone’s Bridge, and for other 
purposes. By Professor J. VIRTAMU JONES ............s0ccccssgssuenvenseswas 907 
. On Slide Resistance Coils with Mercury Contacts. By Professor J. 
SGT ATU LONGHS |< s;prcinasiecosew'c:<instumapin’ricierasnnpeideck Tees Gace was eee eee 907 
. On the relative Merits of Iron and Copper Wire for Telegraph Lines. By 
SVs seeaRuTOO Te: HAE. “mio. ou dajuistetlesietasiew's sles Seoeate ae seen cosets ae eles see enon 907 
SATURDAY, SEPTEMBER 12. 
On Orthopic Loci. ‘By the Rev. 0. TAvVLOR, DID) s...,esseebareeeewene «se 909: 
2, On the Reduction of Algebraical Determinants. By W. H. L. RussExt, 
for) 
Eats, Gia Wane snvies oceennus¥ reaps vdeas gnsievapasons sas ned cnveahspreranee eae aan 910: 
. Account of the Levelling Operations of the Great Trigonometrical Survey 
oLledia.. By Major AoW: BATRD, RvB, BRCS,, .......acontposeupeemeraee 911 
. A Theorem relating to the Time-moduli of Dissipative Systems. By Lord 
ATUL, ACG, MTs obese dy... codecs eecect caateee cf cececee ee eameeEeeat 911 
. On a new Polariser devised by Mr. Ahrens. By Professor Srnvanvs P. 
ETOMESONG HOO: otanc ecstatic cs cconteccatras toes cuueens dk woseeecebece ce aaeeaS ee 912 
. On a simple Modification of the Nicol Prism giving Wider Angle of Field. 
By Professor S1nVANUS P. THOMPSON, D.Sc. ........0.ccccsccocssvcseonscascescs 912: 
. On some of the Laws which regulate the Sequence of Mean Temperature 
and Rainfall in the Climate of London. By H. Courrmnay Fox, M.R.C.S, 912 
. Notes upon the Rotational Period of the Earth and Revolution Period of 
the Moon deduced from the Nebular Hypothesis of Laplace. By W. F. 
SrA, TE GHS SHREVE S:” .coccnetcees soccaeecscnessssontebes Gecete: CotEaaaaEeEa 915 
- On a Galvanic Battery. By C. J. BURNETT ..........ssscsceoscccsesnsnars oie. 916 
MONDAY, SEPTEMBER 14. 
. Report of the Committee on Standards of White Light...................00008 916: 
. Photometry with the Pentane Standard. By A. Vernon Harcovrt, 
INAS RIES, cnacswnaco ncinnesnanelieh slaeees are te tantra? 916 
. On a Photometer made with Translucent Prisms. By J. Joty, B.E....... 917 
. Report of the Committee for reducing and tabulating the Tidal Obser- 
vations in the English Channel, made with the Dover Tide-gauge; and 
for connecting them with Observations made on the French coast ......... 917 
. Seventeenth Report of the Committee on Underground Temperature ...... 917 
. Fifth Report of the Committee on Meteoric Dust ..... BEET bloc dee eee 917 
. A Tabular Statement of the Dates at which, and the Localities where, 
Pumice or Volcanic Dust was seen in the Indian Ocean in 1883-84. By 
CHARLES MEGDRUM, F.RAS.. ,..<ncc.20<secehen¥vepip <= caaenen doadidanntpoeeeeee ana 917 
