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vl CONTENTS. 
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Fourth Report of the Committee, consisting of Professors TimpDEN and 
Ramsay and Dr. Nicou (Secretary), appointed for the purpose of inves- 
tigating the Properties! OL SOUPIONS:...2--.caessce t=. scnoee oe dwseint aor seeder teneaee 310 
Fourth Report of the Committee, consisting of Professors TrtpeN, M‘Leop, 
Prcxerine, Ramsay, and Youne and Drs. A. R. Lreps and Nicoz 
(Secretary), appointed for the purpose of reporting on the Bibliography of 
SOLU DKON 1 | SoA. Rane ene: code seucooAAcicortobcansarreeendhe a ssoak voles sinttie ct eehde Selene eases 310 
Discussion on the Theory of Solution. The present Position of the Hydrate 
Theory of Solution. By Spencer Umrrevitre Picxerrne, M.A., F.R.S. 311 
Provisional Report of a Committee, consisting of Professors H. M‘Lxop and - 
W. Ramsay and Messrs. J. T. CunDALL and W. A. SHENSTONE (Secretary), 
appointed to investigate the Influence of the Silent Discharge of Electricity 
om Oxygen! and other'Gases| <.2c....cscc sncctosceve tence ssacatsce leach seneaaenetteet te 338 
Report of the Committee, consisting of General Frstine (Chairman), Dr. 
H. E. Armsrrone (Secretary), Captain Abney, and Professor W. N. 
Harrxey, on the Absorption Spectra of Pure Compounds .................0655 589 
Report of the Committee, consisting of Dr. H. Woopwarp, Mr, R. 
Ernertper, Mr. R. Kinston, the Rev. G. F. Wuipporns, and Mr. J. E. 
Marr (Secretary), appointed for considering the best methods for the 
Registration of all Type Specimens of Fossils in the British Isles, and 
TEpottansy On thessawla rn... 2. ccnycs cases se deaaoascoseusese setscnce sakeee hee epee eee 339 
Eighteenth Report of the Committee, consisting of Professor Presrwicn, Dr. 
H. W. Crossxkry, Professors W. Boyp Dawxtns, T. McKrnny Hvueues, 
and T. G. Bonnry, and Messrs. C. E. Dk Rancz, W. Peneetry, J. PLant, 
and R. H. Trppeman, appointed for the purpose of recording the Position, 
Height above the Sea, Lithological Characters, Size, and Origin of the Erratic 
Blocks of England, Wales, and Ireland, reporting other matters of interest 
connected with the same, and taking measures for their preservation. 
(irawnup by Dr, (CRosskmy, Sectetary).tc.codéescdeeessees’ess ves ses cueeeneeneee 340 
Sixteenth Report of the Committee, consisting of Drs. E. Hvrn and 
H. W. Crosskey, Sir Dovetas Gatron, Professor G. A. Lenour, and 
Messrs. JAMES GLAISHER, EK. B, Marren, G. H. Morton, W. PENGELLY, 
James Pxrant, J. Prestwicu, I. Roserts, T. S. Srooxr, G. J. 
Symons, W. Torrey, Ty.pEen-Wricut, E. WretHEReD, W. WHITAKER, 
and C. k. Dr Rance (Secretary), appointed for the purpose of investigating 
the Circulation of Underground Waters in the Permeable Formations of 
England and Wales, and the Quantity and Character of the Water supplied 
to various Towns and Districts from these Formations. (Drawn up by 
CSE meAN CHE CpOrter)Roiecess.sacateseeceateucdiaeieces: liv isienascet se eee 352 
Final Report of the Committee, consisting of Mr. J. W. Davis, Mr. W. Casu, 
Dr. H. Hicks, Mr. G. W. Lamptucu, Mr. C. Retry, Dr. H. Woopwarp, 
and Mr. T. Boynzon, appointed for the purpose of investigating an Ancient 
Sea-beach near Bridlington Quay. (Drawn up by G. W. Lampiuen, 
SECLEMALY)) Mite donenidae boast oeesein setosa nels «ce Staches weOiaebinaacaeesmes ceee sc alee eee 375 
Report of the Committee, consisting of Dr. H. Woopwarp, Mr. G. R. Vine 
(Secretary), Drs. P. M. Duncan and H. C. Sorpy, and Mr. C. E. Dm Rance, 
appointed to prepare a report on the Cretaceous Polyzoa. (Drawn up by 
Mr. G. R. Vive) 
Report of the Committee, consisting of Mr. H. Bavermay, Mr. F. W. Ruprmr, 
Mr. J. J. H. Teart, and Dr. H. J. Jonnsron-Lavis, appointed for the in- 
vestigation of the Volcanic Phenomena of Vesuvius and its neighbourhood, 
(Drawn up by Dr. H. J. Jounston-Lavis, F.G.S., Secretary) 397 
Fourth and final Report of the Committee, consisting of Mr. R. Eraprien, 
Dr. H. Woopwarp, and Mr, A. Bett (Secretary), appointed for the purpose 
