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CONTENTS. Vv 
Page 
Mi; Ani Improved Record Receiver ic. ...0.2.ieccsecetsnsenseoadeaeotesses 43 
IV. The Origins of large Earthquakes in 1905.............:sesseeeeeeeeeees 3 
VY. On International Co-operation for Seismological Work............ 45 
VI. Seismological Work now in progress. ..........sssecseeeeeeeeeneeeereees 46 
VII. Directions in which Seismological Work may be extended ...... 48 
VIII., Experiment at the Ridgeway Fault ........ 0... s.cocccscscescertesenee 51 
Underground Temperature—Twenty-third Report of the Committee, con- 
sisting of Professor J. D. Everrrr (Chairman and Secretary), Lord KELvin, 
Sir ARCHIBALD GxHIKIE, Professors Epwarp Hott, A. 8. HerscHet, and 
G. A. Luzour, Messrs. A. B. Wynnz, W. Gattoway, JosppH Dickinson, 
G. F. Deacon, E. WetHpred, and A. SrraAHAN, Professors MicH1E SMITH 
and H. L. Cattenpar, Mr. B. H. Brovex, and Professor Haroxp B. 
Drxon, appointed for the purpose of investigating the Rate of Increase of 
Underground Temperature downwards in various Localities of Dry Land 
and under Water. (Drawn up by the Secretary.) ..........cscseeeeeseeeeeeeees 51 
Meteorological Observations on Ben Nevis.—Report of the Committee, consist- 
ing of Lord McLaren, Professor A. Crum Brown (Secretary), Sir Jon 
Murray, Dr. ALEXANDER Bucuan, and Mr. R. T. Omonp. (Drawn up 
inh Ji fey Lea CEE 8) ie wocmacBpe bose Gaacdc. POSSE CRE OOe BRO SORE EEE ppdooce contig: Honcrogooosoree 56 
The Study of Hydro-aromatic Substances.—Report of the Committee, con- 
sisting of Dr. E. Divers (Chairman), Dr. A. W. Crosstey (Secretary), 
Professor W. H. Perxty, Dr. M. O. Forstsr, and Dr. H. R. Le Suzur... 60 
Wave-length Tables of the Spectra of the Elements and Compounds.—Report 
of the Committee, consisting of Sir H. E. Roscozn (Chairman), Dr. Mar- 
SHALL Warts (Secretary), Sir Norman Locxyzr, Professor Sir JAmMEs 
Dewar, Professor G. D. Liveine, Professor A. ScHustTER, Professor W. N. 
Hartzey, Professor Woxtcorr Gisss, Sir W. pp W. Anyey, and Dr. W. E. 
EA TIERIIINE. “Sec gagre SS Cpe SaSE LARGE ace dNepcotne: dit gn 26nd Janse OseeeenoccL caceREO Eno SBre 66 
‘The Stereochemistry of Nitrogen. By H. O. Jonus, M.A., D.Sc. ............25. 169 
Mynamic Isomerism. By T. M. LowRy, D.Sc. ......0....0.csseeccsseccsceseecneenes 193 
ieininagmetory and Histories). ..2.1..c0¢assassmansee cscs spetiemeesessssacene 193 
II. The Nature of Dynamic Isomerism..,.............000s0seecessseceeaes 196 
Ii. Isomeric Changes in which Two Radicals are Interchanged ...... 200 
IV. Isomeric Changes in which a Single Mobile Radical is Transferred 204 
emo poicale lriverst Gm nce c ieee: tit se cecen ei teannsinwicvnsaedecemeategmione 211 
VI. Chemical Properties of Dynamic Isomerides ..................2..00005+ 214 
VII. Physical Properties of Dynamic Isomerides .............. ia (Op 2438 216 
Wert Reverciple Polymeric Qhange’ 7.22.2 ..cc2scsnnscuveccseddocetsersseteeses “DOO 
The Movements of Underground Waters of North-west Yorkshire.—Fifth 
Report of the Committee, consisting of Professor W. W. Warts (Chair- 
man), Mr. A. R, DwrerRyHovssE (Secretary), Professor A. SMITHELLS, Rey. 
HK. Jonzs, Mr. Watrer Morrison, Mr. Groree Bray, Rev. W. LowEr 
Carrer, Mr. T. Farrtny, Professor P. F. Kenpatt, and Dr. J. E. Marr 225 
Life-zones in the British Carboniferous Rocks.—Report of the Committee, 
consisting of Dr. J. E. Marr (Chairman), Dr. WHrreLton Hinp (Secretary), 
Mr. F. A. Batuer, Mr. G. C. Crick, Dr. A. H. Foorp, Mr. H. Fox, 
Professor E. J. Garwoop, Dr. G. J. Hinpe, Professor P. F. Kenpatt, Mr, 
R. Kinston, Mr. G. W. Lampruen, Professor G. A. Lespour, Mr. B. N. 
Pracu, Mr. J. T. Sropss, Mr. A. Srrawan, and Dr. H. Woopwarp. (Drawn 
PUY At NOMSCCKCUATY.)i stscto iii atecncasters otters stctecccelceeesntscdinteres aeceeeess 226 
Erratic Blocks of the British Isles.—Ninth Report of the Committee, consisting 
of Dr. J. E, Marr (Chairman), Professor P. F. Kenpatt (Secretary), Professor 
T. G. Bonnzy, Mr. C. E. Dz Rancz, Professor W. J  Sottas, Mr. R. H. 
Tippeman, Rey. 8. N. Harrison, Dr. J. Horns, Mr. F. M. Burton, 
