Vi REPORT — 1901. 



Page 

 List of Substances the Absorption Spectra of which have been studied in 

 connection with the Chemical Constitution of Organic Compounds ... 225 

 The Methods for the Determination of Hydrolytic Dissociation of Salt-Solu- 

 tions. By R. C. Faemee, Ph.D., M.Sc 240 



The Relative Progress of the Coal-tar Industry in England and Germany 

 during the past Fifteen Years. By Aexhue G. Geesn, F.I.C., F.O.S, ... 252 



The Application of the Equilibrium Law to the Separation of Crystals from 

 Complex Solutions and to the Formation of Oceanic Salt Deposits. By 

 Dr. E. Feankland Aemsxeong 262 



Keish Caves, co. Sligo. — Interim Report of the Committee, consisting of Dr. 

 R. F. ScHAEFF (Chairman), Mr. K. Ll. Praeger (Secretary), Mr. G. 

 CoFFET, Professor A. G. Cole, Professor D. J. Cunningham, Mr. A. 

 McHeney, and Mr. R. J. Usshee, appointed to explore Irish Caves 282 



Erratic Blocks of the British Isles. — Report of the Committee, consisting of 

 Mr. J. E. Mare (Chairman), Mr. P. F. Kendall (Secretary), Professor 

 T. G. Bonnet, Mr. C. E. De Range, Professor W. J. Sollas, Mr. R. H, 

 TiDDEMAN, Rev. S. N. Haeeison, Mr. J. Hoene, Mr. F. M. Burton, Mr. 

 J. LoMAS, Mr. A. R. Dwerethousb, Mr. J. W. Stathee, and Mr. W. T. 

 TucKEE, appointed to investigate the Erratic Blocks of the British Isles, 

 and tro take measures for their preservation. (Drawn up by the Secretary.) 283 



Life-zones in the British Carboniferous Rocks. — Report of the Committee, 

 consisting of Mr. J. E. Maer (Chairman), Dr. Wheelton Hind (Secretary),. 

 Mr. F. A. Bather, Mr. G. C. Cetck, Dr. A. H. Foord, Mr. H. Fox, 

 Professor E. J. Garwood, Dr. G. J. Hinde, Professor P. F. Kendall, Mr. 

 J. W. KiEKBY, Mr. R. KiDSTON, Mr. G. W. Lamtlugh, Professor G. A. 

 Leboue, Mr. B. N. Peach, Mr. A. Steahan, and Dr. 11. Woodward. 

 (Drawn up by the Secretary.) 288 



The Structure of Crystals. — Report of the Committee, consisting of Professor 

 N. Stoet Maskeltne (Chairman), Professor H. A. Miees (Secretary), Mr. 

 L. Fletchee, Professor W, J. Sollas, Mr. W. Barlow, Mr. G. F. Her- 

 bert Smith, and the Earl of Berkeley, appointed to report on the Present 

 State of our Knowledge concerning the Structure of Crystals. (Drawn up 

 by Mr. Barlow and Professor Miers, assisted by Mr. Herbert Smith.) 



Part I. — Report on the Development of the Geometrical Theories of 



Crystal Structure, 1666-1901 297 



The Movements of Underground Waters of North-west Yorkshire. — Second 

 Report of the Committee, consisting of Professor W. W. Watts (Chair- 

 man), Mr. A. R. Dwerryhouse (Secretary), Professor A. Smithells, Rev. 

 E. Jones, Mr. Walter Morrison, Mr. G. Bray, Rev. W. Lower Caetbb, 

 Mr. W. Faieley, Mr. P. F. Kendall, and Mr. J. E. Maer 337 



Photographs of Geological Interest in the United Kingdom. — Twelfth Report 

 of the Committee, consisting of Professor James Geikie (Chairman), Dr. 

 T. G. BoNNEY, Professor E. J. Garwood, Dr. Tempest Anderson, Mr. 

 Godfrey Bingley, Mr. H. Coates, Mr. C. V. Crook, Mr. J. G. Good- 

 child, Mr. William Geat, Mr. Robeet Kidston, Mr. A. S. Reid, Mr. 

 J. J. H. Teall, Mr. R. Welch, Mr. H. B. Woodwaed, Mr. F. Woolnough, 

 and Professor W. W. Watts (Secretary). (Drawn up by the Secretary.)... 339 



Ossiferous Caves at Uphill. — Report of the Committee, consisting of Professor 

 C. Lloyd Moegan (Chairman), Mr. H. Bolton (Secretary), Professor W. 

 Boyd Dawkins, Mr. W. R. Baekee, Mr. S. H. Reynolds, and Mr. E. T. 

 Newton, appointed for the purpose of excavating the Ossiferous Caves at 

 Uphill, near Weston-super-Mare 352 



The Zoology of the Sandwich Islands. — Eleventh Report of the Committee, 

 consisting of Professor Newton (Chairman), Dr. AV. T. Blanford, 



