TRANSACTIONS OF THE SECTIONS. xi 
TRANSACTIONS OF THE SECTIONS. 
[An asterisk * indicates that the title only is given. The mark + indicates the same, 
but with a reference to the Journal or Newspaper in which it is published in extenso.] 
Section AA—MATHEMATICAL AND PHYSICAL SCIENCE. 
THURSDAY, AUGUST 1. 
Page 
Address by Professor A. E. H. Lovz, M.A., D.Sc., F.R.S., President of the 
IEG UIOIG *iceetatt ices was’esbaceheoseacccldnaines SAE Aeneas dar taeea venabaseaeanataeeesats 427 
1. *Helium and Radio-activity in Common Ores and Minerals. By Hon. 
ev ey SLR UBUD yeh gE vaio y ecietklesicee-sles/sciseichlasistevouiebcbasiesssatsupeehiercsindraenesi 439 
2. tOn the Motions of Ether produced by Collision of Atoms or Molecules 
containing or not containing Electrons. By Lord Ketvin, G.C.V.O., 
HER ae ie alse atetdm x lnatote te cstauad aloleslalas oe anialruaw a abvh Wale sulbpiivsansieneys 439 
3. On Secular Stability. By Professor Horace Lams, F.RAS. .....sccccceeeeee 439 
FRIDAY, AUGUST 2, 
*Discussion on the Constitution of the Atom. Opened by Professor E. 
FD PA ERROR DE Eis, gecmaswaesenckenchvenovee vouan nine eesborehcnnnnsenpeeererrsenides 439 
1, *On Variability in the Products resulting from Changes in Radium 
Emanation. By Sir Wittiam Ramsay, K.C.B., FLRS. oes. eeeee seen 440 
2. Pseudo-high Vacua. By F. Soppy and T. D. MACKENZIE ...............008 440 
3. On the Range of Freedom of Electrons in Metals. By Professor J. 
TAR MORy NGGUR. Si... «ct osdesvs sou doveddseevncdtede delaccdeahueecavccveceteecuuccscses 440 
4, Report of the Committee on Electrical Standards (p. 73) .........sscssceeeees 440 
MONDAY, AUGUST 5. 
1. Optical Pyrometry. By Dr. L. HOLBORN .......ccccceseesesssscnseeseeceeeenes 440 
Ee Uptical Pyromoetry. Hy Professor OC. FGRY | .....0...0sccsncessceessesiencsneses 442 
DEPARTMENT OF MATHEMATICS. 
1. *An Account of Modern Work on the Calculus of Variations. By Pro- 
FESSOR At Eu; MOBSYUH, SE GEU.Owecssseses sees ssscs savasevevaasdde adunadepetmetrsae tess 445 
2. Some New Results in the Theory of Functions of a Real Variable. By 
Dre We Ea YVouna, ERS oc ccceisssceaee eae dia asgcianddacastecaraentGeeee matescenes 445 
3. On a Remarkable Periodic Solution of the Restricted Problem of Three 
REO ER ORRES Wie DN SERVO way feck <seinndoavernarscanysseasedeacs cases cers 446 
