8 FEB. 1908 



FEBRUARY 1908, 



No. 613 



(No. 391 of currtnt teritt) 



NATUaUST.( 



1 



A MONTHLY ILLUSTRATED JOURNAL OF 



NATURAL HISTORY FOR THE NORTH OF ENGLAND. 



EDITED BY 



T. SHEPPARD, F.Q.S., F. S. A. Scot. v^J^^ ^^^^ x 



The Museum, Hull ; ^ ^ 



T. W. WOODHEAD, Ph.D. .F.L.S., 



Technical College, Huddersfield. 



WITH the assistance AS REFEREES IN SPECIAL DEPARTMENTS OF 



J. GILBERT BAKER, F.R.S. F.L.S., QEO. T. PORRITF, F.L.S., F.E.S., 



Prof. P. F. KENDALL, M.Sc, F.Q.S., JOHN W. TAYLOR, 

 T. H. NELSON, M.B.O.U., WILLIAM WEST, F.L.S. 



Contents : — 



PAGES 



Notes and Comments :— Dr. H. C. Sorby, F.R.S. ; New Methods of Geological Study ; 

 Currents and Sand; Clay Deposits; Ancient Volcanic Eruptions; Minute Cavities in 

 Rocks ; Extent of Pressure upon Rocks ; Lord Kelvin ; The Netherworld of Mendip ; 



Dangers of Cave Exploring; Scientific Results 33-38 



Marine Beds in the Coal Measures near Doncaster— ff. Culpin. 39-40 



Lincolnshire Fresh-water Mites— C. F. George, M.R.C.S 41 



The Fossiliferous Deposit at Bielsbeck, East Yorks 42-45 



Colour Photography of Rock Sections under Polarised Light—/. W. Patterson, F.C.S. 46-47 



in Memoriam— Nicholas Frank Dobree 48-50 



—Rev. R. W. Linton 5X 



,, —Robert Law, F.Q.5 52-59 



jpleld Notes (Illustrated) 50,60-61 



Reviews and Book Notices 38, 40, 41, 47, 51, 62-63 



Northern News ... 59,63-64 



Illustrations 61 



Plates VI!., VIII. 



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