TRANSACTIONS OF THE SECTIONS, 
Section A.—MATHEMATICAL AND PHYSICAL SCIENCE. 
THURSDAY, SEPTEMBER 20. 
Page 
Address by Professor Henrict, Ph.D., F.R.S., President of the London . 
Mathematical Society, President of lis Section’ .<<i.2..e sis oh AM 393 
1. Third Report of the Committee on Meteoric Dust .............cseceeceseeees ees 400 
2. ae oo Spectroscopic Appliances. By Professor ArrHur ScHusrTER, 
alesis Stas ouen'sshOuioGatewncsteceeesecensceducscwscddsess ensacase teeter tense nereneres 400 
3. On the Absorption Spectrum of Didymium Chloride, By Professor 
ARTHUR SOMUSTER, Ei l.S.5 BOM Gr. SATHNY y.cccscecceosasccsssceeecomentes 400 
4, On the Cause of Crystalline Form. By G. Jounstonr Stoney, F.R.S.... 400 
5. A specimen of the Work of the new Chronograph at Dunsink Observa- 
tory. By Professor Ropert 8. Batt, LL.D., FLR.S. ....... ec eeeeeeeeeee 400 
6. Experiments in Bolometry. By Professor Stivanve P. THOMPSON......... 401 
7. On the Equations of Motion and the Boundary Conditions for Viscous 
Fluids. By Professor OsBoRNE REYNOLDS, FLR.S. ........ssccccssseceeeeeees 401 
8. Suggestions for facilitating the use of a delicate Balance. By Professor 
HAOVOWIVAVGBIGH, AIR: Stesctcacccccceecoscocsuseecbeoes stoeis scsivespedesctuecease omeeme 401 
FRIDAY, SEPTEMBER 21, 
. Report of the Committee for constructing and issuing practical Standards 
for use in Electrical Measurements .......csececcececececececsesecssoncesnceecasece 402 
. On a case of Rapid Diffusion ot Molten Metals. By Professor CHANDLER 
ROBERTS HE Pu Saieccccecsecssintscd soscasstiesedacemsetetdates sceenessesducsac cases suseneee 402 
. On the Magnetic Baglin! and Retentiveness of Soft Iron. By Pro- 
fessor J. A. IBIWENG UES SCrg ick ScLie Mcecnscnssencasecesccrconcencodsaccsenenmeeee 402 
. On Maxwell’s Equations for the Electro-Magnetic Action of Moving Elec- 
tricity. By Professor PIrzGREALD, FUELS, scccconss0ssc0csssecsasscassnapeeaeeee 404 
. On the Energy lost by Radiation from Alternating Electric Currents. 
By Erotessor VITZGERALD, PRG. '.c..s0.0secpsescacessanacee ssasesessexsse eae 404 
. On a method of producing Electro-magnetic Disturbances of compara- 
tively Short Wave-lengths. By Professor FrrzgERALD, F.R.S. .......0006 405 
. Gyrostatic Determination of the North and South Line, and the Latitude 
of any place. By Sir Wint1am THOMSON, F.R.S.........0..cceecsecssseeeneeee 405 
. On a Model illustrating Helicoidal Asymmetry, and particularly the for- 
mation of Right- and “Left-handed Helicoidal Crystals from a non-Heli- 
coidal Solution. By Sir WrL1AM THOMSON, F.R.S. .....ccceeeeceeeeeceeees 405 
. Report of the Committee for the Harmonic Analysis of Tidal Obser- 
VALIOUSt 5 o0 vasiede sever Meee eae avai nncens cue vaeesees ened sslcsteesSesskeeceoee eaten 405 
