TRANSACTIONS OF THE SECTIONS. xiii 
DEPARTMENT OF ASTRONOMY AND CosmicaAtL Puysics. 
. *The Variation of Latitude. By Dr. O. BACKLUND ...............ccsseeeeeees 463 
2. On some recent Developments of the Method of Forecasting by means of 
Synoptic Charts. By W. N. Saaw, LL.D., Sc.D., F.R.S....... cece eee es 46 
9 
. *A Mountain Observatory in South India. By OC. Micure Suirn......... 465 
. The Variability in Light of Mira Ceti and the Temperature of Sun-spots. 
yee VerAt Lp OORTEE S Sidisck. RUGAGS. ein susnta te dasthcecasahies satin ceeusieeees 465 
. On a Method of improving the Constants of the Plates for the Astro- 
graphic Catalogue. By Professor H. H. Turnmr, F.RS. .............00006 465 
. On the Determination of Periodicity from a Broken Series of Maxima. 
By Professors. El, D RNR, BIR Siisicksieatld oc & snedcbcsanee dotudeousencsisacts ot 466 
. An Analytical Study of the Meteorological Observations made at the 
Glossop Moor Kite Station during the Session 1906-1907, By Marcgarer 
WVinITIS eV. RING, ands HP MTAVET, RSs scccoc-egeectccnersaneeass 467 
. Sixth Report on the Investigation of the Upper Atmosphere by means of 
HSTHESE (AOD) Weacramanssaeanee ca see oe sonata kiana de saceccaa\stetinespaccutcctaeeashaseaeevce 467 
. On the recent Balloon Ascents. By W. A. Harwoop and J. E. Prravet, 
HEU Syme artiste cid es nse nseircctee ec cciscaias caadue Spine dss U's sapivelenslvelrebeespetesiso sees 468 
. Report on Meteorological Observations on Ben Nevis (p. 100) ............... 468 
. “Results of recent Researches on the Physics of the Earth. By Dr. 
4h, Usd BESTOP ack a BSE CREE DOSCOT RCE ee eer OEE Ere Pt pr aries tb eae at 468 
. Report on the Magnetic Observations at Falmouth Observatory (p. 93)... 468 
Section B.— CHEMISTRY. 
THURSDAY, AUGUST 1. 
Address by Professor ARTHUR SMITHELLS, B.Sc., F.R.S., President of the 
IS YEPO EG) aU eye oO AR «CS Ee atc a De ae en 469 
Discussion on Valency :— 
(i) *The Nature of Valency. By Professor W. J, Porn, F.R.S. ...... 480 
(ii) *Zur Valenzfrage. By Professor A. WERNER ..........:ecseesseeeeee 480 
(ut}e Valoncy, Ry Professon-B: ABwGG. 5.55.2.3...scaece-icaesecescassrsscesss 480 
(iv) Divisibility of Valency. By Professor Hugo KAUFFMANN ......... 480 
Ge weleney« sty Wee He Mi DAMES 9 .acnvarssscurensaderdddedensiqtaniceserses 481 
(vi) Note on the Intimate Structure of Crystals. By Professor W. J. 
STEUER [op Ds Palo Mage maha ae as eerie BAH cen errr se 481 
FRIDAY, AUGUST 2. 
+Joint Discussion with Section G on Explosion Temperatures ..... Med ieab outs 482 
1. *The Ignition Point of Gases. By Professor H. B. Dixon, F’.R.S.......... 482 
2, Iron Carbonyls. By Sir James Duwar, F.R.S., and H. O. Jonzs, D.Se. 482 
3. On the Conductivity of Electrolytes in Pyridine and other Solvents. By 
KBNNETE SOMERVILGE CATD WRU: sco cvscecssaceveeessvertecsawacnecacsnsseaecseess 483 
MONDAY, AUGUST 65. 
1. The Applications of Grignard’s Reaction. By Antex. Mackenzie, M.A., 
Pee UD et DIS) cho con saiee- ceasoaece saan ee ev ihe Pass 484 
