TABLE OF CONTENTS. 



G. PouLETT ScEOPE, Esq., AI.P., F.R.S., F.G.S., &c., &c.— Oa the Probable 

 Influence upon the Internal Structm^e of Rocks, of the Mutual Friction of 

 their Component Parts, when forced into motion under extreme pressures 361 



Rev. p. B. Brodie, M.A., F.O.S., &c., &c. — Contributions to the Geology of 



Gloucestershire 370 



Rev. W. S. Symonds, Pendock. — Notes of a Geologist in Ireland during August 



and September, 1857 - 377 



Dr. J. J. W. Watson, F.G.S. — On Mercury in Alluvial Deposits - - - 386 



Catalogue of Government Survey Maps and Sections 389 



Dr. T. L. Phtpson. — Foreign Correspondence 393 



Notes and Queries - 400 



Reports of Geological Societies 402 



Reviews 402 



A GEICXJLTUR AL A K D C H E M I C A L COLLEGE, 



38 and 39, Lower Kennington-lane, London. 

 Principal— J. C. NESBIT, F.G.S., F.C S., &c. 

 In this Institution unusual facilities are afforded for acquiring a thorough 

 knowledge of agricultural, general, and analytical chemistry, and also of surveying 

 and mathematics. 



The terms for students, resident or non-resident, may be known on application. 

 Analyses and assays of every description are promptly and accurately executed at 

 the College. 



TO TOURISTS IN liTORTH WALES.—" The Geological Structure of 

 Merionethshire and Carnarvonshire," by Professor A. Ramsay, F.R.S., and G.S. 

 Illustrated by a Panoramic Diagram, drawn from the summit of Cader Idris, by 

 Percy W. Hengill, Esq., C.E., reprinted, with additions, from the Geologist, Vol. I, 

 No. 5, 1858. Cloth Is. 6d., stitched Is. 



London: Reynolds and Co., 15 Old Broad-street; Simpkin, Marshall, and Co., 

 Stationers' Hall court. 



DOUBLE REFRACTIKG SPAE.— Mr. Tennant, Geologist, 149 Strand, 

 has just received from Iceland some unusually large and fine specimens of this 

 interesting mineral. Mr. Tennant arranges Elementary Collections of Shells, 

 Minerals, Rocks, and Fossils, to illustrate Conchology, Mineralogy, and Geology. He 

 also gives Practical Instruction in Geology and Mineralogy. 



Just Published, price One Shilling. 



OlS^ THE EXTRACTION of* the PRECIOUS METALS, by means of 

 Mitchell's Patented Amalgamating Machinery. Also a description of the various 

 modes at present in use for tha treatment of Auriferous and Argentiferous substances. 

 By .John Mitchell, F.C.S., Author of " Manual of Practical Assaying," " Metallurgical 

 Papers," Slg. 



To be had of Percival Clay, 37 Old Broad Street, London, E.G. 



"POSSIL-EISH, FROM THE OLD RED SAKDSTOKE, EOR SALE. 

 -■- — Five assorted specimens of the Osteoleopis sent on receipt of Post Office Order, 

 for 10s. 6d. Also, specimens of Coccosteus, &c., at very low prices. Fossils from other 

 Formations at equally low prices. 



Also, some fine and rare minerals, precious stones, &c. 



Geological and other Scientific Books and Periodicals, British and Foreign, forwarded 

 post free immediately on receipt of the published price. 

 James R. Gregory, 59, Frith Street, Soho, London, W. 



