TRANSACTIONS OF THE SECTIONS, xii 
Page 
2. The Variation of the Specific Heat of Mercury at High Temperatures. 
iby Erotessor Ey T. BARNES; DISC. .icttrcccs-ccnssvscsscsscatscssevessceave 403 
3. The Relation of Vocal Quality to Sound Waves. By T. Proctor 
HAAR re NAc PE DOL) NED btrsaensaiecacacaadc.ssitetea cates uasecs iseet tapes cue 404 
4. Electric Splashes on Photographic Plates. By Anrrep W. Porter, 
LEIS ate nasc SSE sO SABE aay SAUER aCe an nde nae ana ex ira RR Ry A ena 404 
5. *The Photographic Action cf Alpha Rays. By T. Kryosutvta ...... 405 
6. *On Secondary Radiation by Gamma Rays on different Metals. By 
Esare SS One Ate Sam Hivillt ar cee sy cee unas ctgacounncceinauntete sua sFes cos cndeaar nese 405 
7. On the Active Deposits from Actinium in Uniform Electric Fields. 
ES VIAWEAL WES EININIDD SY, AMA CANS betcaincitdsvanahictetar’ aatatlawenikscusle abaaula eee amt 405 
8. The Effect of Light on Sulphur Insulation. By F. W. Barzs ......... 405 
. The Charge on Gaseous Ions. By T, Franck and Dr. W. Westruar 406 
10. The Recombination of Ions in Air at different Temperatures. By 
pee MUO ED See rr omieenancosme cunuinsy hacevecmenen. fecuneneteernetcs rete senate 407 
11. The Terminal Velocity of Fall of Small Spheres in Air. By 
Professor JOHN ZELENY and L. A. MCKEBHAN ...............0..:0000 407 
12. Report on the Magnetic Observations at Falmouth Observatory 
(72s G16) ERAS CRBEER cboninsaSaaranbiada 1050 chris cktckirWaneed et isr oe eet teeter aie 408 
15. Report on the Geodetic Arc in Africa (p. 37) .........cecceseseceeeeeeseees 408 
14. Kighth Report on the Investigation of the Upper Atmosphere by 
NTE AMIS TOLLS (0g) SU) Mess neciecnys «dass csmdourauncetMucwmucesanetp danse nails 408 
15. Report of the Committee on Electrical Standards (p. 38) .............4. 408 
16. Report of the Seismological Committee (p. 48) ........c::ecseceueeeceeeeues 408 
17, Report of the Committee to aid in Establishing a Solar Observatory 
PUA RSEE MIME e100) sreagor ss eases rnaursntinats cers sadateynaeaentatinngsseens ss 408 
TUESDAY, AUGUST 31. 
Discussion on Earth Tides. Opened by Professor A. E. H. Love, F.R.S. 408 
18 
2. 
DEPARTMENT OF GENERAL PuHysics. 
The Lengthening of Loaded Wires when Twisted. By Professor 
ells OVANTIN Gwi IU Oe cemacaaseaa his tdeestasoedenanendudaetenacnatea sien 409 
The Angular Momentum in a Beam of Circularly Polarised Light. 
By Protessor J: El. POvrrinGy, Wee 6 feb «cae Aca sasapelt veep simp hone th « 409 
. The Effect on the Persistence of Vision of Fatiguing the Eye with 
Red, Orange, and Yellow. By Professor FRanK ALLEN, Ph.D.... 410 
- A New Method of Measuring the Luminosity of the Spectrum. By 
Pe iueeton mr Ae, Ammen Pb ENS. ovals saiteatvepe deb luaidsateasscndecsecvas 410 
. The Effect of Low Temperatures on Fluorescence Spectra. By 
Professor Epwarp L. Nicwors and Ernest MERRITT ................ 41d 
. Absorption and Fluorescence of Canary Glass at Low Temperatures. 
By ibs Cc, Gipss eee eee bee tennee Pe dtR TREE Aedes Seeadidalidsaiadentl 4il 
