MAY 1921, 



No. 772 



No. 546 of current Series 



A MONTHLY ILLUSTRATED JOURNAL OF 



NATURAL HISTORY FOR THE NORTH OF ENGLAND. 



EDITED BY 



T. SHEPPARD, M.Sc, F.G.S., F.R.G.SKVNf^^i^A.Scot./^/V^ 



The Museums, Hull: / -j V 



AND f 



T. W. WOODHEAD, Ph.D., M.$^., WM.sl,7 1921 



Technical College, HuddersfieldX 

 WITH THE ASSISTANCE AS REFEREES IN SPECIAL 



lEPAiiTMENTS OF 



G. T. PORRITT, F.L.S., F.E.S. ^^t'ln r, o I M wS^^^ 

 JOHN W. TAYLOR, M.Sc. RILEY poR"^^' 



Contents :— 



Notes and Comments (illustrated) : — ' Moorlog ' ; Trees in Moorlog ; 

 The Dogger Bank Flora ; Animal Remains ; The Vasculum ; The 

 Genus ' Taeniocampa ' ; The Cissbury Earthwork ; A Remarkable 

 Theory ; Oyster Shells ; Geology of Mesopotamia ; Science in 

 1853 and 1921 ; The Report ; A Tower of Babel ; A Yorkshire 

 Archaeologist 



Nesting Status of the Black -headed Gull in Yorkshire — H B 

 Booth, F.Z.S., M.B.O.U 



Why is Boreus a Winter Insect } — Chris. A . Cheetham 



The Conglomerates underlying the Carboniferous Limestone in 

 the N.W. of England—/. A. Butterfield, M.Sc, F.G.S 



Sex Habits of the Great Crested Grebe — Edmund Selous 



The Spiders of Yorkshire — Wm. Falconer 



Pseudodiadema variolare (Brongniart) in the Lower Chalk of 

 North Lincolnshire — T. Sheppard, M.Sc, F.G.S. ... 



In Memoriam :— Dr. L. C. Miall, F R.S. (illustrated) 



Peat Investigation — W. H. Burrell ... ... ... 



Committee of Suggestions : Insect Associations — Chris. A . Cheetham 



Y.N.U. : List of Sectional Officers and Committees of Research, 

 1921 



Field Notes : — Gagea at 1125 ft. altitude ; Fungi in Yorkshire, etc. ; 

 Sturgeon at Whitby ; Wood Ant in Cumberland ; Heronries in 

 Yorkshire ; Hypnum crista-castrensis Linn, near Carlisle... 168, 176, 182 



Reviews and Book Notices ... ... ... ... ... ... ... 172, 188 



News from the Magazines 158, 180, 184, 187 



Northern News 181, 191, 192 



Illustrations 154, 183 



LONDON : 



A. Brown & Sons, Limited, 5 Farringdon Avenue, E.G. 4. 



And at Hull and York. 



Printers and Ptiblishers to the Y. N, U. 



153-158 



159-166 

 167-168 



169-172 

 173-176 

 177-180 



181 

 183-184 

 185-186 

 186-187 



189-191 



Price 1/- net. Prepaid Subscription 10/6 per annum. 



