REPORTS ON THE STATE OF SCIENCE. - V 



Page 

 Seisolological Investigations. — Thirteenth Report of the Committee, con- 

 sisting of Professor H. H. Ttjeneb (Chairman), Dr. J. Milne (Secretary), 

 Dr. T. G. BoNNEY, Mr. C. Vernon Boys, Sir George Darwin, Mr. 

 Horace Darwin, Major L. Darwin, Professor J. A. Ewing, Dr. R. T. 

 Glazebrook, Mr. M. H. Gray, Professor J. W. Judd, Professor C. G. 

 Knott, Professor R. Meldola, Mr. R. D. Oldham, Professor J. Perry, 

 Mr. W. E. Pltjmmeb, Professor J. H. Poynting, Mr. Clement Reid, and 

 Mr. Nelson Richardson. (Drawn up by the Secretary) 60 



I. General Notes 60 



II. Sites of Stations 62 



III. On the Orientation of an Instrument with regard to the Building 



in which it is placed 63 



IV. The Large Earthquakes for 1907 63 



V. After-shocks of the Jamaica Earthquake, January 14, 1907 .... 64 



VI. On the Dissipation of Earthquake Motion as measured by Ampli- 

 tude and Duration 67 



VII. On the Direction in which Earthquake Motion is most freely pro- 

 pagated 74 



VIII. A Catalogue of Destructive Earthquakes 78 



IX. On a Seismogram obtained in London on October 16, 1907 .... 81 



X. Map of the World. By R. D. Oldham 82 



XI. A Catalogue of Chinese Earthquakes. By Shinobu Hirota . , 82 



Dynamic Isomerism. — Report of the Committee, consisting of Professor 

 H. E. Armstrong (Chairman), Dr. T. M. Lowry (Secretary), Professor 

 Sydney Young, Dr. C. H. Desch, Dr. J. J. Dobbie, Dr. M. 0. Forster, 

 and Dr. A. Lapworth. (Drawn up by the Secretary) 112 



The Transformation of Aromatic Nitroamines and Allied Substances, and 

 its Relation to Substitution in Benzene Derivatives. — Report of the 

 Committee, consisting of Professor F. S. Kipping (Chairman), Professor 

 K. J. P. Orton (Secretary), Dr. S. Rtjhemann, Dr. A. Lapworth, and 

 Dr. J. T. Hewitt 115 



Wave-length Tables of the Spectra of the Elements. — Report of the Com- 

 mittee, consisting of Sir H. E. Roscoe (Chairman), Dr Marshall Watts 

 (Secretary), Sir Norman Lockyer, Professors Sir James Dewar, G. D. 

 Liveing, a. Schuster, W. N. Hartley, and Wolcott Gibbs, Sir W. de 

 W. Abney, and Dr. W. E, Adeney, appointed to prepare a New Series of 

 Wave-length Tables of the Spectra of the Elements 119 



Colloid Chemistry. By H. R. Procter, M.Sc 201 



The Study of Hydro-aromatic Substances. — Report of the Committee, con- 

 sisting of Dr. E. Divers (Chairman), Professor A. W. Cbossley (Secretary), 

 Professor W. H. Perkin, Dr. M. O. Forster, and Dr. H. R. Le Sueur . . 221 



The Excavation of Critical Sections in the Palaeozoic Rocks of Wales and 

 the West of England.— Report of the Committee, consisting of Professor 

 C. Lapworth (Chairman), Mr. G. W. Feabnsides (Secretary), Mr. J. 

 LoMAS, Dr. J. E. Marb, Professor W. W. Watts, and Mr. G. W. Wil- 

 liams 231 



On some Excavations in the Cambrian Rocks of Comley, Shropshire, 

 1907. By E. S. Cobbold, F.G.S 23) 



