JULY 1917. 



No. 726 



(No. 502 of currant ttriat) 



A MONTHLY ILLUSTRATED JOURNAL OF 



NATURAL HISTORY FOR THE NORTH OF ENGLAND. 



EDITED BY 



T. SHEPPARD, M.Sc, F.G.S., F.R.G.S., F.S.A.Scot., 



The Museums, Hull ; 



AND 



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



Technical College, Huddersfield. ^<L'~ 



WITH THE ASSISTANCE AS REFEREES IN SPECIAL DEPARTME 



J. OILBBRT BAKER, P.R.S. P.L.S., GEO. T. PORRIT 



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



RILEY FORTUNE, P.Z.S. 



. p m^6n p 7' s " 



Contents : — 



Notes and Comments (illustrated) :— South Eastern Naturalists; The Bulletin; The 

 President's Address ; Unity, Organisation, Co-ordination ; A Full Programme ; Science 

 Progress; Age of the Earth ; Salt Water and Salmon ; Scratches on Flints ; Cause and 

 Effect ; The Collector ; Evolution of Geological Maps ; Early References'to Geology- 

 Soil Maps ; The First Geological Map ; Later Maps; Natural History in 1485 ; Victoria 

 and Albert Museum ; A Business Museum ' 209-216 



Oolite Grains in the Upper Lias of Grantham (illustrated)— H. Preston, F.G.S., and 



A. E. Trucman, M.Sc. 217-218 



Occurrence of Boulder Clay at Huddersfield (illustrated)— T. W. rVoodhead,M.Sc„ Ph.D. 219-232 



Abnormal Spiders— Wm. Falconer 232-233 



Dreissensia polymorphs Pallas — Hans Schlesch 234 



In Memoriam: Samuel Margerison— H.E.IV 235-236 



T. McKenny Hughes, M.A., F.R.S., F.G.S., F.S.A. (illustrated)— T.S. 237-238 



Field Notes i—Limnea stagnalis introduced into Cumberland ; May-blobs Poisoning Bees 239 



Proceedings of Provincial Scientific Societies 218, 240 



Northern News 216,218,233,238,239 



News from the Magazines 240 



Illustrations 215, 217, 220, 221, 223, 225, 226, 228, 237 



LONDON : 



A. Brown & Sons, Limited, 5, Farringdon Avenue, E.C. 



And at Hull and York. 



Printers and Publishers to the Y.N. U. 



Prepaid Subscription 6/6 per annum, post free. 



