CONTENTS. X1 
Page 
11. Photographs of the Invisible, in Solar Spectroscopy. By OC. Prazazt 
eePrn eT CMA NT WN) re ot epee bisindic aleolinecteoiei as ee RR aaa oe neiswda'yh sa MSALE Mosh we cee ech 750 
12. On Meteorological Photography. By Joun Horxtnson, F.L.S., F.G.8., 
Ne ate cnc o te phopscdp nsin Da virscphine SBapanaiaureialoiit sated he heeieles nde 751 
, 13. On the Spectra of the Elements and the Constitution of the Sun. By 
‘ MERTEN he MO WUAED, | acl dsiominnaiganiuaniahontias cian Sewstep ap hide taesey aa «hook 751 
-4, On Regional Magnetic Disturbances in the United Kingdom. By Pro- 
fessors A. W. Rutcxer, F.R.S., and T. E. Toorps, F.RB.S. ............000005 751 
15. Sur les perturbations magnétiques en France. By Professor E. Mascart 751 
16, Exhibition of Photographs of Clouds. By Friese GREENE............000.5 751 
TUESDAY, SEPTEMBER 9. 
1. Optique minéralogique.—Achromatisme des Franges. By Professor E. 
Mice aga caste aa ieeeMae dics Jadit ehanen ne Noannafii-tRenuaren saoe% Sem ve ack be 762 
2.. Instantaneous Photographs of Water Jets. By Lord Rayzeren, Sec. 
» doondodesecie pepdabOn6"t/060 HbrindB sh oudodedgnop soa s UB cd dappe encod CCS er Ea oR COA erence 752 
3. Report of the Committee on Electrical Standards ..........6......cececseeeeees 752 
4. On Variations in some Standard Resistance Coils. By R.T. GLazEBRoox, 
PENDS che ntic 2 cloyie ox shi Unan an doidoes anauateignvacadeed <Goina saya Psuaes Pee tess 752 
5. On some Standard Air Condensers. By R. T. GuazenRoox, F.R.S., and 
eremret A LR BAM Noss tices antye sudan asidide sd vnnynadavsesy danddsesan thie tetstactok 752 
6. On the Specific Resistance of Copper. By T. C. Frrzparrick............... 752 
7. A Comparison of a Platinum Thermometer with some Mercury Thermo- 
Pets Wels yeJBi elias CUR TMBLTHSY.\ ta. acsabendeannsedaasarescadactpmane dren essjeoaseenales 752 
8. On the Character of Steel used for Permanent Magnets. By W. H. 
Sep raten (RNP LPR SP Ea cence s Sain oh cle nle ec Oaoweoit santas adacse§ aubemen oats ste lorglaernceal 752 
_ 9. The Effect of Oxidation on the Magnetic Properties of Manganese Steel. 
Ret ACS HA BEDE rn: cx a. tude nota cans sas <efdatseauidatd~ Gus CdadokaAdeheede 753 
10. On Testing Iron. By J. Swinsurne and W. F. BouRNE.............c000000s 753 
ll. The Compensation of Alternating-Current Voltmeters. By. J. 
empnage  NEs E autora, ak a man BS Se etree dle sn nbdundae sv cvenidek ead ab ercns Lav Gs 753 
12. Note on a Kinetic Stability of Equilibrium with Electro-magnetic 
orces. By Professor,G. FH. FITZGBRALD, .FURIS.. ....0:cesescesceseassoeneee «ie 753 
13. On Electrical Oscillations in Air. By J. TROWBRIDGE.............cec00eceee 754 
14, On the Electrostatic Forces between Conductors and other matters in 
connection with Electric Radiation. By Professor Or1ver J. Lover, 
RMR ae eeictr cates cwiss tevin shinecednuetabsfseacet dete eaadacanamersented ss kien sides asetas 754 
WEDNESDAY, SEPTEMBER 10. 
1. On Atom-grouping in Crystals (with exhibition of a Model), By W. 
ARLEN a Bye Eo 5 cos Ree re eee MO Cee ene hh ean 754 
2. On an Episode in the Life of J (Hertz’s Solution of Maxwell’s Equations). 
Pye ProtemonGabs PitTzGERALD, PBS sise lich. aeeeeetil. kai 755 
. Report of the Committee on Molecular Phenomena attending the Mag- 
METIS A TLONNO MLE OTM st eee Oita. a Aes dsc sands, Galbdateic Me MoReee sen roe ke Bene 757 
. Note on the Relation between the Diffusion of Motion and Propagation of 
Disturbance in some turbulent Liquid Motions. By Professor G. F. 
IWVEZGERALD EVENS hans caccehbe dence fbeis oe EEE slactdaieg sete aesbecepatetions 757 
